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아버지가 이상해
Mi Yeong, Hye Yeong, Ra Yeong, and Joon Yeong are the kids of Yeong Sil and Han Soo. They seem like the average Seoul family, with the typical Seoul problems, but that all changes when Jung Hui, an actor, and former K-Pop idol, ends up in their doorstep claiming that Han Soo is his biological father. The family goes through thick and thin, one marriage after the other, trying to figure out why their father happens to be strange.
Na Yeong-sil has an unpleasant first encounter with Oh Bok-nyeo. Cha Jeong-hwan and Byun Hye-yeong reunite eight years after their breakup.
Determined to land a role in an upcoming miniseries, An Jung-hui searches for his biological father. Byun Mi-yeong contemplates a job offer.
Jeong-hwan and Hye-yeong share a night of passion. While trying to hide from Kim Yu-joo, Mi-yeong makes an unforgettable first impression on Jung-hui.
Byun Jun-yeong's sisters find out about his dating life. Hye-yeong feels uneasy after seeing Jeong-hwan's co-worker ask him out.
Jung-hui's honest plea earns him another audition. Yeong-sil and Bok-nyeo reach an agreement about rent. Yu-joo humiliates Mi-yeong at work.
Curious about his father, Jung-hui visits Byun Han-soo's eatery as a customer. Hye-yeong and Jeong-hwan get back together.
Jung-hui tells Han-soo who he is, and is enraged by his reaction. Jeong-hwan asks Hye-yeong to move in with him. Yu-joo takes a pregnancy test.
Yu-joo asks Jun-yeong about his family and shares big news. Using her knowledge of Park Cheol-su's secret, Byun Ra-yeong asks him for a favor.
Jung-hui ignores Han-soo's attempts to meet him. Hye-yeong discusses moving out with her parents. Yu-joo looks into Jun-yeong's family business.
Hye-yeong and Jeong-hwan begin cohabitating. Jun-yeong takes the civil service exam and vows to tell his parents about Yu-joo, who's growing impatient.
Yu-joo introduces herself to Jun-yeong's parents. A missing ring brings Yeong-sil, Bok-nyeo and their children to the police station.
With a lawsuit in hand, Hye-yeong tells Bok-nyeo to apologize to Yeong-sil. Yu-joo meets Jun-yeong's family as its newest addition.
Jeong-hwan apologizes on behalf of his mother. Jung-hui drops by Han-soo's store for a drink, but leaves enraged after seeing a joyful family dinner.
In need of real-life family experience for his role, Jung-hui makes a surprising request. The explosive secret behind Han-soo's identity is revealed.
Han-soo tries to persuade Yeong-sil into letting Jung-hui join their household. Bok-nyeo shows up unannounced to Jeong-hwan and Hye-yeong's apartment.
News of Han-soo's son is met with shock by his children. Jeong-hwan's changed entry code and attitude during a blind date makes Bok-nyeo suspicious.
Living under one roof as half-siblings, Mi-yeong avoids Jung-hui at work. Yu-joo offers Jun-yeong an alternative to looking for a home of their own.
Hye-yeong confronts Yu-joo, and Mi-yeong meets with Jun-yeong to tell him about Yu-joo's past. Ra-yeong catches Jeong-hwan and Hye-yeong together.
Mi-yeong asks for a different position. Lee Yun-seok's tragic past is explained. Yeong-sil and Bok-nyeo find out about their children's relationship.
Hye-yeong becomes the target of her family's disappointment and anger. Jung-hui's interview about his father changes Mi-yeong's mind.
