Yun Su, a new resident from Cheonan, moves into a shared house and tries to hide his identity, but his roommate, Ha Jin, catches him out, sparking a delicate emotional battle. Through punishment dates and casual flirtations, the two move beyond pranks and threats, becoming drawn to each other. However, Ha Jin's sudden departure and public confession spark a conflict, forcing Yun Su to choose between secrecy and honesty.