Shin Chae-yeon is an anxiety ridden 16-year-old girl who used to live with her parents who abuse her since she was a kid. She felt trapped in a lonely and traumatized cycle that happened 6 years ago because of the trauma. She runs away from home and meets Ahn Yu-Jin’s d her brother, Ahn Jung-ho. While she’s staying with them with Yu-Jin’s family and joining the two siblings’ friends, Seong Min-jae and Kang Ha-rin in a detective club in Yeonghwa High School. Will she get a happy ending?