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Yi-ju é visto como uma alma gentil, que coloca os outros em primeiro lugar. Porém, o desrespeito que ela sofre está longe do que ela merece. Seu desejo por uma família a leva por um caminho de retidão, mas tudo desmorona no leilão de caridade da Galeria Han. Diante de horrores indescritíveis, um acidente fatal se abate sobre ela e, com a respiração cada vez mais fraca, ela reza por uma chance de redenção.

Ao perceber que voltou a um ponto anterior ao casamento, Yi-ju decide seguir um curso de vida diferente. Sua madrasta e meia-irmã, não mais consideradas parte de seu círculo familiar, transformam-se em suas adversárias mais formidáveis. Ela inicia o processo rompendo o casamento com um homem mais inclinado a sua irmã, e então orquestra um esquema para semear o caos dentro de sua suposta família.

É somente lendo um artigo sobre um pequeno incidente no parque com Do-guk que Yi-ju descobre seu motivo oculto. Ao confrontá-lo, ela pressiona por uma explicação e, para sua alegria, isso acaba sendo bastante reconfortante. Para aumentar a surpresa, Do-guk propõe que ela resida na casa dele, sem a presença dele. Sentindo uma sensação de confiabilidade, Yi-ju aprecia o momento, sem saber das incertezas que virão.

A próxima fase se desenrola no casamento contratual de Yi-ju e Do-guk enquanto suas famílias se reúnem para a discussão inicial sobre sua união iminente. Jung-hye permanece alheia à orquestração de Yi-ju, e seu espanto aumenta quando Yi-ju apresenta uma de suas réplicas como um presente surpreendente. Apesar do retrato superficial, Yi-ju emprega uma linguagem severa com Do-guk, lembrando-o de não cruzar limites em seu casamento fingido. Do-guk luta para mascarar sua evidente decepção.

The day after the incident at the ferry port, Yi-joo learns that Do-guk is dealing with a panic disorder. Believing that Jung-wook holds crucial information about Do-guk's condition, she arranges a meeting with him, going against Do-guk's explicit request not to meet him. Despite her worry for Do-guk, he sternly warns her not to cross the boundaries of their contractual relationship. Seeking comfort, Yi-joo visits her grandfather and encounters an incredible story about her birth.

Yi-joo comes close to a regrettable choice at her wedding with Do-guk, driven by the realization of Jeong-hye's manipulation, but Do-guk intervenes just in time. The morning after the wedding, Do-guk discovers a note from Yi-joo and her empty room. Meanwhile, Yu-ra views Jung-wook as an ideal instrument for her schemes.

Even though it all began as a contractual arrangement between Yi-joo and Do-guk, her sentiments for him evolved over time. On the flip side, Yu-ra and Jung-wook seem on the verge of establishing their own agreement driven by sheer greed. Their sinister intentions promptly take shape as they expose the confidential contract between Yi-joo and Do-guk to the entire family.

Now that the secret pact between Do-guk and Yi-joo has come to light, the entire family is rife with disappointment and demands for justification. Jung-wook seizes this moment to press Do-guk even harder, but Do-guk appears to be one step ahead in every move. Meanwhile, Yi-joo's plan faces unexpected disruptions as rumors about her begin circulating and spiraling out of control.

With Jin-woong in the hospital, Jeong-hye declares herself the new interim chairman of Hanul. With plans to make her position permanent, she starts trying to win over shareholders. However, Yi-joo is onto her plan and starts doing the same. Meanwhile, Jin-woong becomes aware of Yi-joo's identity and starts to suspect Jeong-hye.

Jeong-hye's plans to take over Hanul for good fail as Chairman Han Woon-jae, Yi-joo, and Yi-joo's birth mother speak against her at the shareholders' meeting. Meanwhile, Yu-ra discovers that she is pregnant with Jung-wook's child and that Yi-joo is Jin-woong's biological daughter. She slowly comes to realize that her perspective of reality has been wrong all along.

Cho Dong-soo rats out Jeong-hye to the police, and they both get arrested. Yi-joo and Do-guk seem to enjoy their lives until Do-guk confesses that he is the reason why they both came back in time. Meanwhile, a construction site worker hired by Taeja's subcontractor dies on the job. Jung-wook tries to sweep things under the rug.

Jung-wook breaks out of jail and kidnaps Yi-joo in an attempt to torment Do-guk. However, Do-guk is determined to save Yi-joo from the same fate that made them go back in time that fateful day, even if it means risking his own life to do so. As their repeated time draws to an end, Yi-joo and Do-guk feel unsure about what will happen in their future. Will they find happiness and peace in the end?