During the school's festival, Seul-gi and Je-yi momentarily set aside their rivalry, enjoying the festivities together. However, the discovery of a compromising video involving Seul-gi's father and Je-yi's missing sister, Je-na, on a stolen phone, shatters their brief respite. The episode culminates in a violent confrontation, leaving Seul-gi injured and Je-yi face-to-face with her long-lost sister.