Chapter:1
Kang so-young :(intro)
A school bully who found pleasure in bullying Eun-bi. Her transfer to Eun-byul's school soon leads to mistrust and problems between the students.Orphan Lee Eun Bi has aspirations to teacher. However after standing up for a student, she is the target of a group of bullies, led by Kang So-young. The bullying escalates and she is expelled from school. After her expulsion, Lee Eun Bi attempts suicide by jumping from a bridge. In contrast, Go Eun-byul grows up privileged and loved. Although incredibly popular at school, she battles with guilt over the knowledge of her twin sister (amongst other things). On a school trip, Go Eun-byul disappears.