About the title
The police are exhausted searching for a gang of sadists who film videos for snuff fans. After getting a lead and chasing down the ringleader, Detective Choi Jae-hwan disappears without a trace along with him, and a month later both are found in a car that has crashed. The criminal, once he regains consciousness, insists on speaking only with Detective Kim Min-seon and claims that, for some unknown reason, they have swapped bodies — that he is the real Jae-hwan, and the maniac has settled into his family's midst. Min-seon is torn by doubt, but more and more evidence suggests that his senior colleague really has ended up in the killer's body.