When Karina, the school's untouchable beauty, impulsively claims quiet and timid Y/n as her new boyfriend to escape her selfish ex, she offers him a three-month contract. What starts as a fake relationship slowly turns real through Y/n’s genuine small efforts and gentle love, until the contract ends, leaving Karina heartbroken and determined to turn their pretend romance into forever.

After Sumin caught her boyfriend, Minseok, cheating on her, she was heartbroken. She ended up drunk at a bar. She met a kind stranger who turned out to be her friend's boyfriend. What starts as a messy night and a fake-dating revenge plan quickly turns into something deeper, leading the three of them into an unexpected poly relationship.