The following content is intended for mature audiences and may contain sexual themes, gore, violence and/or strong language. Discretion is advised. The story follows Bum, a young mentally ill man with a difficult past. After becoming infatuated with Oh Sangwoo, a peer from his time in the military who saved him from a rape attempt, he decides to enter Sangwoo's home while he is out of his house. Bum finds a tied up, bruised woman in Sangwoo's basement and before he is able to free her, he is discovered by Sangwoo, who is revealed to be a serial killer. +