An impromptu trip to the seaside becomes an opportunity for Chowon and Seoha to mend their relationship, but it's also a trip down memory lane for Jieum. While reminiscing on her old life as Juwon, Jieum gets lost in the past...but when she's caught in a moment of carelessness, Chowon becomes increasingly suspicious! Moreover, when an old classmate reminds Doyun of his status, he puts a foot down in his relationship with Chowon, causing the rift between them to grow ever wider...