A boy falls to his death at school, but Ok Chanmi does not believe that her twin brother, Park Wonseok, committed suicide. Chanmi transfers to her brother's school, Yongtan High, and meets Ji Sooheon, who witnessed her brother's death.
Elenco: Shin Ye-eun , Lomon , Seo Ji-hoon , Chae Sang-woo , Lee Soo-min , Chung Su-bin , Kim Joo-ryoung , Woo Yeon , Jin Ho-eun , Yeon Oh .