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Su Ji é uma psiquiatra renomada do Hospital Haedeul, e ela sempre está ocupada. Por outro lado, sua irmã, Na Young, é uma repórter de rua de programas culinários que almeja ser âncora. Enquanto isso, U Ri recebe é dispensado do serviço militar e segue diretamente para o Hospital Haedeul.

Depois de uma promissora apresentação de investimento para a Bibi Roll, Jang Soo está otimista em avançar sua posição na indústria de restaurantes. Do Young se vê em uma delegacia depois de uma confrontação de batalha de rap com seu rival de longa data. Su Ji é encarregada de ser a apresentadora da festa de 50º aniversário do Hospital Haedeul, enquanto U Ri expressa decepção com sua tendência de priorizar outras coisas em vez dos pacientes.

U Ri passa o dia lidando com os persistentes pedidos dos pacientes de Su Ji e dos responsáveis dos pacientes. Enquanto isso, Su Ji enfrenta as memórias de sua infância que ressurgem inesperadamente. Sem saber do tormento interior de Su Ji, U Ri fica irritado ao descobrir que Su Ji descartou o presente de Sun Young. Enquanto isso, o aniversário de Jin Tae é marcado pela indiferença de Ma Ri, que diminui a alegria das festividades.

U Ri fica sobrecarregado de trabalho por causa da agenda cheia de Su Ji. Ele fica ainda mais irritado quando a vê posando para uma sessão de fotos promocionais. Jang Soo estranha não conseguir falar com o Sr. Gong. Na Young pede a ajuda de Su Ji para conseguir aulas com uma famosa apresentadora. Hyun Sung retorna dos Estados Unidos.

Ma Ri e Hyun Sung visitam o templo para prestar homenagem ao falecido pai de Ma Ri, mas Hyun Sung sente que há outra pessoa que Ma Ri está de luto. U Ri recebe um chute esmagador de Su Ji e arremessa suas costas. Enquanto isso, Na Young é convidada para jantar com o diretor-chefe da emissora.

Doo Ri faces a financial dilemma when she's unfairly forced to foot the bill for damaged clothes. Ma Ri asserts control over Jin Tae by unilaterally altering 50th-anniversary plans. As Na Young's cheek swells with a fiery red hue, Yoon Ja's frustration escalates beyond harsh words, intensifying the tension with Su Ji.

Doo Ri refuses to let her hard-earned money slip away without actively seeking out the one accountable. She initiates picketing outside the company's entrance. Following a pleasant dinner with his parents, Hyun Sung encounters Su Ji and U Ri seemingly enjoying themselves together at the restaurant. Meanwhile, Sun Young reflects on the tragic accident she experienced 27 years ago.

Na Young is enraged at Su Ji for not keeping her promise to arrange a lesson with Ms. Son. U Ri is troubled by Su Ji’s abrupt change in demeanor ever since he mentioned seeing her cry at the hospital. Jang Soo is anxious as he frets over Mr. Gong disappearing. Meanwhile, the highly anticipated 50th-anniversary celebration at Haedeul Hospital unexpectedly leads to a reunion with Su Ji's former friend.

Jang Soo's Bibi Roll venture turns for the worse, and he faces unforeseen turmoil. Jung Soon and Sun Young worry about A Ra's entrance to school while still in their care. Meanwhile, Na Young can't stand to see Su Ji's success and becomes overly jealous of her.

Hyun Sung and Su Ji say goodbye after their affection reunion. Na Young uses the handkerchief as an excuse and visits U Ri at the hospital. Sun Young gets an urgent call from A Ra's kindergarten that requires her appearance, and Jin Tae forces Hyun Sung to attend a piano recital. Meanwhile, the Haedeul Hospital's Psychiatry Department has a dinner get-together.

Jin Tae suggests a joint interview to Ma Ri, as Jang Soo rushes to resolve the significant problem he's gotten into before Su Ji discovers it, leaving him in a state of panic. The events of last night lead to a tentative reconciliation between Su Ji and U Ri, though it quickly dissipates. Meanwhile, Hyun Sung is troubled by the man who answered Su Ji's phone call for her.

Jin Tae and Ma Ri stumble upon a heap of gimbap left by Hyun Sung and wonder for whom they are intended. Su Ji and Hyun Sung reminisce about their past while on a date. U Ri ends up telling Su Ji about Na Young's persistent inquiries about her the previous night, leaving Su Ji feeling uncomfortable. Meanwhile, Sun Young aims to play matchmaker between Woo Chang and the kindergarten teacher.

Jin Tae ignores Hyun Sung's intentions and pushes for him to meet a girl from a prestigious family. Yoon Ja suspects Jang Soo of having an affair and tails him, while Su Ji sees A Ra's yellow cape and recalls her young past. Meanwhile, Sun Young asks Woo Chang to spend the weekend together.

Yoon Ja can't figure out what is with Jang Soo, but she still treats him like an ATM. Hyun Sung takes Su Ji as a defensive strategy to the piano recital that Jin Tae forced on him. Meanwhile, the Courtyard House family is ecstatic at the news of Woo Chang and Sun Young going on a date and cheer them on.

Woo Chang is taken aback to discover that Sun Young isn't his intended companion, but another person entirely. After a decade of holding on to it, Hyun Sung finally presents Su Ji with a gift. Na Young receives uplifting news as she learns she's made it to the finals of the audition. Do Young learns about the challenges his father has been facing.

Na Young is frustrated because Su Ji always interrupts her moments alone with U Ri. Su Ji is enraged upon discovering that Na Young has rifled through her cherished possessions. Jang Soo and Do Young are engaged in undercover operations to apprehend the fleeing Mr. Gong. Su Ji is taken aback when she encounters Hyun Sung at the hospital, appearing to be someone she didn’t expect him to be.

Su Ji is shocked when she finds out that Hyun Sung is the new director at the hospital. Meanwhile, something about U Ri keeps bothering Hyun Sung, even though U Ri has zero interest in Su Ji. Ma Ri embarrasses Jin Tae at the company meeting while introducing the hospital’s new crucial business. Yoon Ja is suspicious of why Jang Soo and Do Young are always together throughout the day. Na Young bluntly tells U Ri that she likes him.

Su Ji learns she was nominated to host the program Na Young desperately wanted, while Jang Soo deals with the severe aftermath of the fraud. At Handeul Hospital, Ma Ri and Jin Tae get into a heated discussion when their views on managing the hospital collide. Meanwhile, Na Young calls U Ri for solace after discovering her position as the host got lost to someone else.

Jin Tae sees Hyun Sung with Su Ji in front of the hospital, and Ma Ri discovers pictures of Hyun Sung with Su Ji. Yoon Ja tells Bok Sun that she saw someone who resembled Sun Young, while Jang Soo begins to chase down the partner that left him in shambles. Meanwhile, Na Young is shocked when she learns the identity of the person who took her host position.

Su Ji once again reveals a side of herself to U Ri that she had intended to keep hidden. Sun Young tends to Woo Chang, who falls ill due to her words. Hyun Sung becomes envious upon discovering Su Ji and U Ri napping in the same room during their night shift. Meanwhile, Jang Soo successfully locates Mr. Gong, only to encounter an unexpected obstacle.

The Bibi Roll investors are causing a commotion at the hospital, insisting that Su Ji immediately settle her father's debt. Hyun Sung and U Ri intervene before Su Ji steps into the fray. Meanwhile, Jin Tae is displeased with Hyun Sung's public involvement, referring to him as Su Ji's fiance. Sun Young discovers the reason behind A Ra's fixation on fifty cents.

Su Ji is stunned by the revelation of Hyun Sung's parents. Jin Tae and Ma Ri are shocked upon learning that Hyun Sung's return to Haedeul Hospital is primarily because of Su Ji. Na Young takes action to secure the new program's MC position, confronting the director directly. Meanwhile, U Ri responds to Na Young's confession.

U Ri finds Na Young's behavior strange whenever Su Ji gets mentioned and believes she has a bizarre compulsive disorder against her. Hyun Sung confides in U Ri about how he feels about Su Ji, and Jang Soo's family prepares to move. Meanwhile, Jung Soon becomes furious when she sees a picture of A Ra, Woo Chang, and Sun Young together.

Do Young takes on a part-time job to help the family, and Su Ji gets offered an exclusive contract with a huge signing bonus. Jung Soon can't stand the current relationship between Woo Chang and Sun Young and explodes in anger. Meanwhile, Jin Tae reveals his genuine feelings to his son.

U Ri intervenes to prevent Su Ji from suffering serious harm due to Na Young's actions. Na Young becomes aware that Su Ji's partner is the son of the owner of the Haedeul Foundation. Ma Ri is touched by Jin Tae's proposal to dedicate the new hospital center to her father. Meanwhile, the residents of The Courtyard House organize a family getaway to help calm Jung Soon's troubled emotions.

U Ri recognizes the individual in the video who received a slap from Su Ji. Seeking clarity on the incident, he arranges a meeting with Na Young. Sun Young harbors guilt over Jung Soon's choice to leave their home. Do Young stands up against those who criticize Su Ji solely based on the video. Hyun Sung feels disheartened as Su Ji continuously declines his offers of assistance.

Understanding the harm the viral video is causing her career and seeing patients start to cancel appointments, Su Ji gets ready for a press conference to explain. Ma Ri organizes the press conference for Su Ji. Meanwhile, Do Young narrowly avoids trouble thanks to Doo Ri. Na Young feels more anxious as Su Ji's press conference approaches.

An unexpected event during the press conference ruins Su Ji's image. Hyun Sung takes Su Ji, exhausted from the stress, to his officetel, where he lets her recuperate. Jin Tae suddenly learns that the Jihan Group wants to stop plans to build the research lab. Meanwhile, excitement fills the air at The Courtyard House because of Woo Chang's date.

Jin Tae orders Hyun Sung to step away from any affairs involving Su Ji, while Do Young and Doo Ri establish a debtor-creditor relationship on paper. U Ri goes to Hyun Sung's officetel to talk about Su Ji and sees traces of Su Ji everywhere. Meanwhile, Su Ji and Na Young get into another fight, but someone watches them in secret.

Su Ji gets humiliated by the protesters in front of the hospital, and U Ri saves her. Director Han decides to terminate Su Ji as her scandal is causing the whole hospital to suffer damage. Furthermore, Su Ji gets ready to make an official statement through her show, and another video of her goes viral on the internet.

Su Ji collapses in Sun Young's arms, and Sun Young takes her to the emergency room. Hyun Sung and Su Ji's family head over to the hospital as soon as they hear the news. U Ri visits her later on, but Hyun Sung warns him not to cross the line and sends him away. The next day, Sun Young stops by Su Ji's ward to get her food.

Jin Tae lets go of Su Ji from her position to deal with the issue that's getting out of hand. Jang Soo begins selling Bibi Roll on the streets, aiming for a business comeback. Su Ji confides in U Ri about her desire to release everything and fade away from the world. Doo Ri reaches out to Do Young to share news about an enticing part-time job opportunity.

After Su-ji says no to marriage, Hyun-sung visits Jang-soo and Yoon-ja and asks them for Su-ji's hand in marriage. Yoon-ja's eyes twinkle with joy when she hears that Hyun-sung is part of the Haedeul Foundation's family. Jin-tae misinterprets the videos circulating on the Internet about Su-ji to be true because Su-ji isn't denying them. Meanwhile, Su-ji sadly says her goodbyes to the staff at the hospital as she collects her belongings.

Hyun-sung wants Su-ji to run away with him after being discharged from the hospital, but Su-ji has to wait for her mother to look for her. U-ri writes a letter to Su-ji and leaves it in front of her room at the hospital before he sets off to Haedul Hospital in Chungju. Meanwhile, Na-young gets fired from the show.

Jin-tae visits Sun-young's diner, and they have a chat over a drink. Jin-tae decides to back down and let Hyun-sung marry Su-ji. Therefore, Hyun-sung arranges the family meeting before their engagement without letting Su-ji know about it. Meanwhile, Doo-ri happens to witness Su-ji walking out of the real estate and realizes she is looking for a place to stay.

Su-ji realizes the dinner with Hyun-sung's family was a family meeting to discuss their marriage. Su-ji declares that she will not get married to Hyun-sung and storms out of the restaurant out of anger. Meanwhile, Doo-ri and Sun-young rent out the spare room for Su-ji in secret, and U-ri returns home from Chungju.

In the aftermath of Su-ji's and Hyun-sung's family meeting, Su-ji finds a place to stay where neither Hyun-sung nor her family can find her. The Courtyard House family worries about Su-ji while she sleeps all day without eating. Jin-tae sees the divorce papers Ma-ri kept hidden and is shocked. Meanwhile, Na-young appears in an unforeseen place in front of an unexpected person.

After being ostracized by Hyun-sung and Ma-ri and thinking of the past 30 years, Jin-tae shows a different side to him. At the hospital, Chief Mo and the other colleagues find U-ri suspicious when he leaves work right on time. Meanwhile, Su-ji joins U-ri's family for breakfast to celebrate Ah-ra's birthday, but she has a sudden panic attack.

Do-young and Yoon-ja want to take Hyun-sung's offer, but Jang-soo hesitates for Su-ji's sake. Hyun-sung looks everywhere for Su-ji, and Sun-young prepares for the lawsuit. Meanwhile, Sun-young's family goes out for Ah-ra's birthday dinner, and Su-ji is alone in her room.

U-ri is so preoccupied with thoughts of Su-ji that he can't sleep properly. Hyun-sung is in agony over Su-ji's disappearance but finds comfort in Na-young. Jang-soo decides on Hyun-sung's proposal and shares his thoughts with him. Meanwhile, Su-ji is fed up with Sun-young's constant knocking and insistence on having meals.

Su-ji's breaking point is reached as Sun-young persistently questions her seeming lack of concern for her mother. In her frustration with Su-ji's disregard for her well-being, Sun-young decides on drastic action. Meanwhile, Yoon-ja is surprised by the sheer elegance of Na-young's luxurious new look.

Su-ji asks U-ri why he has been keeping her poster and puts U-ri in an awkward position. Hyun-sung becomes disappointed in Su-ji when he learns she only contacted Jang-soo, and Jin-tae declares he will use a separate room from her. Meanwhile, Na-young's plan to seduce Hyun-sung progresses smoothly.

Sun-young begins to look for her lost daughter through a lawsuit, and Hyun-sung tries his best to stop Jin-tae from leaving his position at the hospital. Meanwhile, Sun-young offers to help Su-ji when she learns she is struggling financially, and Na-young makes her move on Hyun-sung and invites him over for dinner.

U-ri's colleagues barge into The Courtyard House when Su-ji is helping his family with the prepping in the kitchen. Meanwhile, Jin-tae hands in the letter of resignation, and Hyun-sung hears U-ri talking about Su-ji on the phone, so he follows him.

Hyun-sung's consumed by jealousy the moment he learns that Su-ji's sharing a roof with U-ei. Sun-young frets over U-ri, who's caught in the crossfire of Hyun-sung and Su-ji's argument. Jin-tae opens up to Sun-young about his worries. Meanwhile, emotionally wounded by Su-ji, Hyun-sung seeks solace in Na-young.

Na-young turns up at the yoga studio where Ma-ri is a member, trying to get closer to her. Ma-ri is shocked to see how at ease Jin-tae is while chatting with Sun-young. The promotional video for Bibi Roll gets nothing but negative comments nationwide, while Bok-sun hides the fact that she urgently needs to see a dentist. U-ri wants to throw a welcome party for Su-ji, but things get a bit out of hand.

Su-ji and U-ri's drunk behavior becomes the family's moment to remember. Ma-ri screams that she will never let go of Jin-tae, who made her life a nightmare. Yoon-ja has no intentions of letting go of Hyun-sung as her affluent son-in-law, and Na-young tells U-ri to have a happy life living Su-ji, provoking him. Meanwhile, Hyun-sung walks into the restaurant and sees Su-ji doing the dishes.

Hyun-sung suffers emotional damage after talking with Su-ji, and he seeks comfort from Na-young. Ma-ri sees Jin-tae in an unexpected place when he is supposed to be fishing and feels betrayed. Do-young is provoked by Jin-ho and ends up begging Doo-ri to be his pretend girlfriend. Meanwhile, Yoon-ja learns that Su-ji is staying with a male colleague and rushes to The Courtyard House.

Jin-tae moves out of his house as Ma-ri keeps prying into his personal life. Ma-ri gets furious as she realizes he has been spending time with Sun-young at her restaurant. Meanwhile, U-ri helps Su-ji to get back on track and start over again. He decides to muster up the courage and confess his feelings to her.

Hyun-sung is surprised to hear from Ma-ri that his father depends emotionally on someone. Jin-tae is concerned about the apparent closeness between Hyun-sung and the lady neighbor across the hall. With U-ri’s encouragement, Su-ji gathers the courage to begin anew as a doctor. Meanwhile, Yoon-ja encounters someone unexpected while visiting Su-ji.

In her haste to escape, Yoon-ja abandoned her jacket, which Sun-young later discovered, uncovering a lead to locate her. Yoon-ja is haunted by regret over her actions toward Sun-young, actions she wishes she could undo. Meanwhile, Do-young stealthily tails Jang-soo, who claimed he was off to play at an early-morning soccer club, only to stumble upon the disheartening truth. Ma-ri comes across Sun-young and Jin-tae in his office together.

Ah-ra disappears after being shocked by what Su-ji said, and The Courtyard House turns into chaos trying to look for her. Jin-tae sees Su-ji and U-ri at The Courtyard House, and Ma-ri invites Na-young over to her house. Meanwhile, Sun-young and Su-ji have a tense argument over what Su-ji said to Ah-ra.

Hyun-sung feels chaotic getting caught between Jin-tae, who wants to quit the hospital, and Ma-ri, who wants to stop him. After the incident with Ah-ra running away, Su-ji and Sun-young's relationship becomes uneasy, and U-ri tries to appease Su-ji's discouraged mood. Meanwhile, Yoon-ja receives mail that shocks her immensely.

Anger overcomes Hyun-sung, and he does something he shouldn't do. Sun-young worries that U-ri keeps getting involved with Su-ji. Emotionally hurt, Hyun-sung gets drawn to Na-young. Yoon-ja believes Su-ji and Hyun-sung getting married is her only hope and begins to take things into her own hands. Meanwhile, Ma-ri believes Jin-tae is quitting the hospital because of Sun-young.

Sun-young prepares a birthday meal for Soo-kyung despite knowing she won't join her. Meanwhile, Su-ji struggles to sit in front of Sun-young's food due to traumatic memories associated with it, unbeknownst to Sun-young, who is displeased with her attitude. Later, U-ri discovers that it's Su-ji's birthday. Meanwhile, Jang-soo learns that Su-ji is at The Courtyard House.

U-ri plans a small party for Su-ji but faces an unexpected situation. Yoon-ja begs Sun-young to cancel the lawsuit she filed. Na-young coincidentally finds herself in the right place at the right time to prevent Ma-ri from getting into trouble. Meanwhile, Sun-young realises that Su-ji is actually her long-lost daughter Soo-kyung, leaving her unable to forgive herself for not recognising her own child.

While spending time with Hyun-sung, Na-young runs into the producer for "Seeking Hidden Restaurants" and almost gets her identity exposed. Jin-tae hears that Ma-ri's condition is the worst it has ever been in ten years from Chief Mo. Sun-young holds off confessing to Su-ji as she watches her profusely show her hatred for her mother. Meanwhile, Jang-soo learns about the document Yoon-ja tried to hide from him.

Su-ji commits to forgetting her mom and throws away the yellow cape she had treasured. Yoon-ja's long-kept secret comes to light in front of Jang-soo and Sun-young, who stand facing each other for the first time in 27 years. Ma-ri tears up as she remembers the happy days, seeing Jin-tae care for her. Meanwhile, U-ri witnesses Na-young, Ma-ri, and Hyun-sung joyfully together.

U-ri and Sun-young realise Na-young is Su-ji's sister and Yoon-ja's daughter. Therefore, Sun-young wants to reveal the truth behind the videos of Su-ji and Na-young. Meanwhile, Yoon-ja barges into Na-young's apartment as she has nowhere to go after being kicked out of Jang-soo's house. Then she finds out Na-young is secretly dating Hyun-sung, hiding the fact that she is Su-ji's sister.

Su-ji suspects Na-young has hidden agendas as she appears to be getting closer to Hyun-sung with questionable intentions. Ma-ri is profoundly touched by Na-young's thoughtful preparations for her return from the hospital. Sun-young agrees to appear on the TV show for Su-ji's sake. Na-young feels uneasy, fearing Su-ji might expose her actions and lose consciousness.

Hyun-sung and his family are surprised by Na-young’s pregnancy, but Hyun-sung is willing to accept it. Ma-ri and Jin-tae debated whether they would accept Na-young as their daughter-in-law but could not reach a decision. Su-ji pressures the director of "Seeking Hidden Restaurants" to uncover the truth, and Sun-young becomes emotional when Su-ji sincerely thanks her. Meanwhile, Jang-soo rushes to Na-young’s place upon hearing she has a boyfriend.

After Jin-tae and Ma-ri meet Jang-soo and Yoon-ja, they learn that Na-young is Su-ji's sister. Yoon-ja is ecstatic about Na-young's pregnancy, and Hyun-sung is shocked that Na-young and Su-ji are sisters. Su-ji plans to visit her parents after a long time, and Sun-young, who learns of this, calls Jang-soo to keep his mouth shut. Meanwhile, a heart-fluttering moment occurs when Doo-ri visits Do-young to nurse his summer cold.

Na-young reveals that she is pregnant with Hyun-sung's baby and begs Su-ji to save her life. When Su-ji shuts her down, she attempts to stop the producer, who will expose the truth, with money. Ma-ri and Jin-tae reconsider Na-young as a daughter-in-law as rumours about Hyun-sung and pregnant Na-young together spread throughout the hospital. Meanwhile, the producer exposes the truth behind the videos, and Su-ji regains the support of her followers.

Su-ji returns to work, and Sun-young tells Na-young to sincerely beg for forgiveness from Su-ji and to reveal the truth by herself. Na-young breaks up with Hyun-sung out of disappointment and wants to raise her baby on her own. Meanwhile, as Hyun-sung visits the ob-gyn clinic with Na-young, a rumour spreads in the stock market.

Yoon-ja is making a scene at Haedeul Hospital because of what Hyun-sung did to Na-young. Jin-tae is displeased with her almost threatening demeanour, but Ma-ri acknowledges that Hyun-sung also overstepped by questioning the paternity of Na-young's baby. Meanwhile, it's Su-ji's first day back at work and she receives a warm welcome from everyone. Sun-young believes it's time for her to come clean.

Su-ji learns that Sun-young is her mother and discovers that Jang-soo and Yoon-ja also know. Feeling betrayed that Sun-young didn't reveal their relationship sooner, Su-ji is hurt. Sun-young is speechless, torn by her daughter's pain. Meanwhile, Jin-tae opposes Hyun-sung's marriage until paternity is confirmed. Later, Su-ji vanishes from the hospital.

U-ri arrives just in time to prevent Su-ji from a devastating accident. However, Su-ji remains unwilling to consider why Sun-young couldn't come for her. Ma-ri becomes emotional upon seeing the ultrasound image that Na-young gives her. Meanwhile, Jin-tae, though displeased, decides to distance himself from Hyun-sung's marriage affairs.

When Su-ji is about to visit her family, Hyun-sung comes to her clinic to talk to her. Su-ji barges into her parents' house and asks Yoon-ja why she lied to her birth mother, Sun-young, 25 years ago. Meanwhile, Jang-soo witnesses Su-ji and U-ri together and realises U-ri is Sun-young's son.

Even though it was not Sun-young's fault that they broke up, Su-ji cannot forgive Sun-young, so she takes it out on her. Jin-tae wants to file a divorce suit, and Ma-ri asks Hyun-sung for help. Meanwhile, U-ri and Doo-ri suggest Sun-young and Su-ji to spend time alone.

Na-young starts a new life at Hyun-sung’s parents’ house, where she discovers a locked room on the second floor. Sun-young spends meaningful time alone with Su-ji, listening to Su-ji's experiences of loneliness. Meanwhile, Jang-soo's and Jin-tae's families have gathered, and there's a sense that something awkward may occur soon.

Sung-young experiences awkward moments while working at Jin-tae's catering event. As tensions simmer in the dining room, the families of Jin-tae and Jang-soo officially come face-to-face. Meanwhile, U-ri frets over Su-ji's persistent avoidance. Na-young feels uneasy seeing how well Jin-tae and Sun-young know each other. Sun-young makes a significant decision for the sake of Su-ji.

Yoon-ja throws a fit when she sees Jang-soo and Sun-young in a private room together. Sun-young decides to cancel the paternity suit for U-ri and Su-ji's sake, and Doo-ri saves Do-young from a crisis that suddenly appears. Meanwhile, Jin-tae worries about Ma-ri as she anxiously waits for her grandchild to be born in excitement.

Su-ji tells U-ri she wants to break up. U-ri learns it's because Su-ji yearns to become Sun-young's legal daughter. Yoon-ja gets caught snooping around Jin-tae's house by Ma-ri, and Ma-ri's obsession with Hyun-sung's unborn baby grows more significant. Meanwhile, a producer shows interest in Do-young's trot music video that Doo-ri uploaded to the Internet that became viral.

U-ri breaks up with Su-ji to remain as brother and sister, and Sun-young feels bad as she believes it's all her fault. Meanwhile, Jin-tae makes a reservation at The Courtyard House and invites Ma-ri for dinner, but Ma-ri cannot stand it as she sees Sun-young.

U-ri witnesses Ma-ri treating Sun-young rudely and confronts her in anger. This causes Ma-ri to feel deeply disappointed in Jin-tae for not supporting her. Meanwhile, Jang-soo plans to invest all his savings in Do-young's potential as a superstar, and Do-young confesses his feelings to Doo-ri. Su-ji expresses frustration to U-ri for treating her like a little sister so naturally, as if their romantic relationship meant nothing.

Ma-ri weeps as she holds a photo of Hyun-woo, caught in her sorrowful moment by Na-young. Hyun-sung later confides in Na-young about his older brother who disappeared thirty years ago. Yoon-ja faces the challenge of testifying in court to secure Su-ji's legal status as Sun-young’s child. Jin-tae shares with Sun-young the pain that Ma-ri has been experiencing. Meanwhile, Doo-ri once more plays a crucial role in assisting Do-young.

Jin-tae reveals his pain to Sun-young. Ma-ri sees them together and explodes in anger. After learning U-ri broke up with her to allow her to fulfill her wish of becoming Sunyoung's legal daughter, Su-ji falls into deep thought. Meanwhile, Doyoung gets his first offer for a gig as a trot artist.

Jin-tae insists they clean Hyun-woo's room, but Ma-ri refuses with the hope of finding him. The conflict between them still resides. Do-young finishes his first gig successfully, and Jang-soo smiles after seeing Doo-ri's confidence in Do-young. Su-ji pretends not to have heard U-ri's confession last night and acts like a typical younger sister. Meanwhile, Hyun-sung visits Na-young's parents after marrying Na-young.

Su-ji visits Jang-soo's house and sees Hyun-sung and Na-young. Sun-young's heart aches when she sees Su-ji and U-ri act like siblings. Hyun Sung questions Na-young about why she lied about not knowing Sun-young, and Ma-ri rediscovers her hopes of finding her lost son after speaking with Sun-young. Meanwhile, Jin-tae visits Haedeul Convalescent Hospital.

Jin-tae is reviewing a patient chart at a convalescent hospital, while Ma-ri meets with a detective to request a reinvestigation into Hyun-woo’s case. Do-young receives a call from a renowned songwriter. Meanwhile, Su-ji and U-ri spend the entire night talking through a paper phone that Ah-ra created. Hyun-sung invites U-ri for a drink to apologize, but after drinking too much, U-ri ends up taking him home.

While escorting the intoxicated Hyun-sung home, U-ri feels a sense of recognition as he glimpses into a room on the second floor of Hyun-sung's house. Jin-tae reflects on uneasy memories involving his father-in-law. Yoon-ja discovers that there is a missing son in Na-young's in-law family. Su-ji and U-ri conceal their true feelings for each other. Meanwhile, Do-young heads to meet a renowned songwriter.

Jin-tae takes Na-young shopping and urges her to persuade Ma-ri to turn Hyun-woo's old room into a nursery. After shopping with Jin-tae, Na-young visits Haedeul Hospital where she runs into Su-ji and confronts her about her feelings for U-ri. Meanwhile, Bok-sun visits Sun-young, her ex-daughter-in-law, to apologize, and the Patient Day event takes place at Haedeul Hospital.

Su-ji is now legally Sun-young's daughter, but Sun-young has mixed feelings about it. At the Patient Day event, Ma-ri spots a familiar-looking toy, which triggers the memories of the day Hyun-woo went missing. After the event, U-ri finally meets Doo-ri's boyfriend, Do-young, and Jin-tae tries to track down Jung Soon-jung's son.

Ma-ri visits Sun-young and asks her how she came to adopt U-ri. At home, Hyun-sung takes Na-young's side when Ma-ri lashes out at her for wanting to turn Hyun-woo's old room into a nursery. Yoon-ja makes a big mistake at her new job while Su-ji and U-ri begin to regret their decision to remain siblings.

Su-ji struggles to hold back her feelings for U-ri while Ma-ri can't stop thinking about how U-ri was adopted. Ma-ri invites U-ri and Su-ji over for dinner, and Na-young eavesdrops on Jin-tae's phone conversation. Meanwhile, Do-young invites Doo-ri over to meet his family for the first time, and Jin-tae sees U-ri holding a familiar-looking toy.

Jin-tae visits Sun-young upon seeing U-ri's childhood toy while U-ri heads over to Ma-ri's home for dinner. After U-ri's visit, Na-young's sneaking suspicion grows, and Su-ji finds out that Hyun-sung had a brother. The next day, U-ri wakes up from a strange dream feeling sad and confused.

Na-young is curious as to why Jin-tae and Ma-ri are looking for the same person. While tracking down Jung Soon-jung, Ma-ri learns that Jin-tae was also requesting to view Haedeul Convalescent Hospital's patient records from 1998. Meanwhile, at Haedeul Hospital, Jin-tae surprises U-ri with an unexpected offer.

It's obvious to Su-ji's co-workers that she deeply cares for U-ri. Jin-tae goes ahead and cleans out Hyun-woo's room without telling Ma-ri, and Jang-soo finds out that Woo-chang isn't, in fact, Sun-young's husband. Meanwhile, Sun-young and U-ri visit Jung Soon-jung's columbarium niche together where Sun-young makes a shocking announcement.

Sun-young's sudden announcement leaves U-ri shocked and confused, but he can't bring himself to tell Su-ji about it. Ma-ri gets a call from Detective Jang while Hyun-sung learns that Ma-ri suspects U-ri might be Hyun-woo. Meanwhile, Doo-ri runs into someone she absolutely despises while leaving Do-young's place.

Na-young sees the DNA test report in Jin-tae's study and is told to keep it to herself. Ma-ri visits Sun-young to ask about Jung Soon-jung, and Sun-young tells her Jung Soon-jung is U-ri's biological mother. Jin-tae walks into the restaurant when Ma-ri is about to leave, and Su-ji runs to the bus terminal upon hearing that U-ri has left.

U-ri finally makes up his mind and announces to the family that he and Su-ji are now officially a couple. At work, U-ri tells Jin-tae that he must decline the promotion while Ma-ri learns about the offer and grows suspicious of Jin-tae's true intentions behind it. Meanwhile, Sun-young consults Su-ji after Ma-ri's visit, and Yoon-ja visits Na-young to check in on her.

Jin-tae finds out that Ma-ri has reached out to Sun-young for help to order a DNA test, and Yoon-ja overhears a shocking conversation while hiding in Na-young's room. Su-ji asks to see Hyun-woo's room while visiting Ma-ri with U-ri and learns that the room has been emptied out. Meanwhile, Ma-ri's growing obsession with U-ri makes Hyun-sung anxious.

Na-young finally gathers enough clues about the situation to have leverage over Jin-tae, but Hyun-sung begins to suspect that she and Jin-tae might be hiding something from him. Doo-ri finds out that Do-young is Na-young's brother and breaks up with him, while Su-ji is left puzzled by how U-ri supposedly had a congenital heart condition.

Ma-ri visits Sun-young to tell her about the test results and hears that Jin-tae was the one who persuaded Sun-young to help her order the DNA test. Ma-ri has a sudden dizzy spell in front of U-ri while leaving The Courtyard House, and U-ri gets strange flashbacks while looking after her. Meanwhile, Hyun-sung's growing suspicion leads him to Jin-tae's study.

Hyun-sung finds out what Jin-tae and Na-young have been hiding from him. Feeling deeply betrayed, he tells Na-young to move out and tries to persuade Jin-tae to tell Ma-ri everything. U-ri and Sun-young reminisce about their memories together at U-ri's old school after filing for dissolution of adoption, and Hyun-sung visits U-ri.

Su-ji and U-ri's colleagues at Haedeul Hospital find out that they're back together. Ma-ri calls Detective Jang to tell him that she is giving up on the search, but he tells her that he has found a picture of Jung Soon-jung and her son. Hyun-sung urges Jin-tae to tell Ma-ri the truth while Na-young threatens Jin-tae once again. Meanwhile, Do-young follows Doo-ri to her blind date.

U-ri is confused and distraught after finding out that Jung Soon-jung is not his mother, and Su-ji suggests that he register his DNA to find his real mom. Meanwhile, Yoon-ja finds out that U-ri is, in fact, Hyun-sung's brother, and Na-young comes home as per Hyun-sung's request only to find out that he is planning to tell his mother the truth.

While visiting Ma-ri to tell her that the boy in the photo she sent isn't U-ri, Sun-young hears that Soon-jung's cousin is looking for Kim U-ri. Sensing that Jin-tae is hiding something, Hyun-sung presses him for the whole truth, and Jin-tae confesses his secret to him. Meanwhile, Sun-young runs into Yoon-ja again while leaving Ma-ri's house.

Hyun-sung catches Na-young going through his phone and is torn, knowing that both she and Jin-tae want the truth to remain buried. While visiting Holy Mother Hope House with U-ri, Su-ji happens to read a poem U-ri wrote when he was nine. Meanwhile, Sun-young is confused as to why Detective Jang gave her Jin-tae's number and decides to call the owner of Port Restaurant.

Yoon-ja sees Do-young texting Doo-ri and thinks that he has a new girlfriend. Jang-soo visits Sun-young to tell her the truth but gets into an argument with Woo-chang. After Jang-soo leaves, Sun-young consults Woo-chang on what to do with the situation involving Jin-tae, and he suggests she tell Ma-ri that Jin-tae was the man known as Jung Soon-jung's cousin.

U-ri finds out that Ma-ri had done a DNA test with his sample and that everyone else knew about it. Feeling upset and confused, he has drinks with Hyun-sung who came to The Courtyard House hoping to tell U-ri the truth. Hyun-sung sees a picture of U-ri and Jung Soon-jung and feels immense guilt. Meanwhile, U-ri becomes convinced that the dream is part of his forgotten memories that are resurfacing.

Jin-tae tells Ma-ri that U-ri is, in fact, her son Hyun-woo. Together, they visit U-ri at The Courtyard House to tell him that he is Hyun-woo. Meanwhile, Na-young and Hyun-sung get into another argument, which leaves Na-young crying. Shaken up, Na-young calls and tells Yoon-ja that her mother-in-law has found out the truth and that it's all over now.