Ja-young is a flutist. When her father has a child out of wedlock, her mother regards sex as a sin out of anger towards him. Ja-young grows up under her mother's exceedingly oppressive notions. Then by chance, Ja-young's sexual urges are expressed in an abnormal fashion. Her mother is shocked by her daughter's abnormal sexual tendencies. Ja-young's boyfriend Jo-bin starts to detest her but he slowly learns of her situation and begins to understand her. On the other hand, Ja-young suffers much by jealousy of her half-sister Bo-young and Chun Hyung-Seok who takes out his revenge on her. Ja-young ends up in the hospital. All of Ja-young's problems stem from a single source. After Jo-bin learns of the reason behind her actions, he deeply understands Ja-young.