When his partner was murdered and the killer went free, Yoonseok took justice into his own hands. Now he's the pawn of a prosecutor who sends him into danger, his body sexually violated by criminals as a way to gather information. He's little more than a husk, hoping for death, when he begins investigating the gangster Baek Gitae, whose violent sadism triggers something in Yoonseok. Is he seeking out the gangster's sexual aggression as a way to escape his pain? Or is he beginning to enjoy it?