A bad lock accident forces the rational and restrained Lin Shuwei to take in Jiang Che, the soaking-wet neighbor boy. The fourteen-day lodging agreement, originally out of elder-like care, quickly turns into a probing life for two. The innocent-looking young man who calls her "Sister" at every turn not only possesses a fiercely oppressive physique, but also pushes forward step by step in daily life. When luxury cars are parked continuously downstairs, Jiang Che's carefully disguised poverty and vulnerability are completely exposed. Facing this long-planned cohabitation trap, Lin Shuwei, who is used to controlling everything, must decide whether to take back the keys or rewrite the rules of the game for this dangerous relationship.