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Do Hyun Joong, a fallen bodybuilding star, now manages a rundown 24-hour gym. Lee Mi Ran, fresh off a breakup, mistakes it for a nightclub and ends up humiliated. Hyun Joong offers to transform her life through intense training, but his brutal honesty drives her away. Still, his words hit a nerve. Can Hyun Joong change heartbroken Mi Ran's life and save the crumbling gym?

Mi-ran sets out on a gruelling fitness journey to win back her ex, and the entire gym gets caught up in her mission. Hyun-joong sees a spark of potential in her, pushing her even harder. But is it for her sake or the gym's survival? As every rep tests her spirit, Mi-ran must confront what she's really fighting for.

Mi Ran's intense training program falls apart and goes to waste after she breaks down in front of her ex-boyfriend. Despite achieving some results, including fitting into an undersized dress, Mi Ran quits the gym and demands a refund, leaving Hyun Joong frustrated. Meanwhile, Hyun Joong puts everything on the line to attract 120,000 new members to the gym, determined to turn the struggling gym around.

Mi-ran struggles with harsh criticism from her visiting mother while Rosa faces pressure to prove herself in a bodybuilding competition. As Hyeon-joong supports both women, emotional bonds deepen—especially when Mi-ran comforts a drunk Hyeon-joong. Rosa overcomes injury and self-doubt to compete, rekindling her confidence. The episode ends with a shocking twist as a child appears at the gym, calling Hyeon-joong “Daddy.”

Mi Ran starts cutting out flour and becomes increasingly irritable, and Hyun Joong struggles with the exhaustion of balancing parenting and work. Tension grows between Hyun Joong and Mi Ran as they fail to understand each other's hardships, and their relationship gets pushed to the limit when all their built-up frustration explodes.

Mi Ran breaks the treadmill at the gym, so Hyun Joong starts offering personal training himself to make more money to get a new treadmill. Sung Im signs up for the PT session with Hyun Joong, and she starts pestering him all the time. Later, Hyun Joong finds out the reason why Sung Im had to stay at the gym all the time. Meanwhile, Mi Ran breaks down after seeing a glimpse of her ex.

Mi Ran tries to move on from heartbreak by tossing out the past, emotionally and physically. She gives up working out, but Hyun Joong notices her slump and gently tries to help her bounce back incessantly. But in his effort to motivate her, he unintentionally reopens old wounds. Their miscommunication deepens, threatening to unravel what little progress they’ve made.

A famous influencer, Kang Sol, registers at Hyun Joong’s gym, helping the gym to get more members. Hyun Joong isn’t glad to see her as she’s his ex, and he can’t help but think she has an ulterior motive. Sol becomes friends with Mi Ran, and she sets her up on a blind date. After a few dates, Mi Ran realizes her feelings toward Hyun Joong are too strong to meet someone new.

The health camp Mi Ran hoped would bring her closer to Manager Do takes a dramatic turn with surprising news about his connection to Sol, but a far more profound truth emerges when Sol confronts a serious personal challenge. Amidst the romantic misadventures, a story of quiet courage unfolds, reshaping everyone's perspectives. The real tests are rarely physical.

Hyun Joong disappears without a trace, and members of the gym are determined to guard the gym until he comes back. Mi Ran tirelessly searches every place Hyun Joong might have gone. Amid the collective effort to save the gym, Ro Sa hears something utterly devastating. Meanwhile, Ji Ran is having a hard time getting over Dan.

After idyllic tteokbokki outings, Mi Ran is bewildered when Hyun Joong suddenly gives her the cold shoulder. Her disastrous attempts to rekindle their connection only make things worse, leading to a painful confrontation. Now, Hyun Joong must decide if Mi Ran is a distraction or his destiny.

Hyun Joong and Mi Ran begin a secret romance. Hyun Joong expresses his love in his own quirky way, and Mi Ran starts to find his oddness endearing. With the gym building falling apart and water leaking everywhere, Hyun Joong faces pressure as the landlord shrugs off responsibility and tells him to deal with it or move out.