Porém as coisas começam a se complicar quando o primeiro amor de Eun-Ji retorna interessado nela e passa a tentar conquistar a mesma.

Certo dia conhece um inusitado garoto que não tem onde morar e acaba concordando em deixá-lo viver com ela e cuidar dele, ao se referir brincando ao garoto falando que ele seria seu animal de estimação Eun-Ji se surpreende pelo mesmo concordar com aquilo, a partir dali Kang In Ho (Jang Geun Suk) se torna Momo seu mais novo pet. Você já assistiu? You're My Pet K-MOVIE : Sinopse: : Ji Eun-Yi (Kim Ha Neul), uma mulher bonita e bem sucedida profissionalmente, mas que sofre por não conseguir ter bons relacionamentos. But when he finds out that his ex-wife is seeing another man, he must fix his relationship with her as a high school student! As if the heavens listen to his words literally, Dae-young sees that he’s 18 again! Given a second chance, Dae-young changes his name to Go Woo-young (Lee Do-hyun) and starts his new life.

Feeling pathetic and hopeless, he goes to his high school and makes a wish by throwing a basketball. Meanwhile, Dae-young looks at himself as an ordinary unemployed middle-aged man and he regrets his life. At this time, Da-jung hands him divorce papers. Dae-young got fired from his job and he is looked down upon by his family. She becomes totally fed up with her husband and is unable to deal with him any longer. Da-jung works hard as a rookie announcer and she has a sincere heart. They have a pair of twins 18 years old son & daughter. However, he destroyed himself by drinking and smoking, ending up as the icon of drastic change. Everyone would scream his name and think of him as their first love. Dae-young was a hot teenager back in high school.

Jung Da-jung (Kim Ha-Neul) is married to 37-year-old man Hong Dae-young (Yoon Sang-Hyun).

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