"I did it" Sunwoo Yeon, known for her low self-esteem and inability to fit in with others at school, has only one obsession: her junior, Nam Chaehyun. When Yeon ends up kidnapping Chaehyun, she is forced to confront her true self. Chaehyun was beautiful and kind, but there was no forgiveness. At some point, the relationship between the kidnapper and the victim had cleverly shifted. "...I didn't mean to kidnap you back then." Yeon realizes she cannot escape from her. Which side will ultimately take control?