He is a murderer in his head and he is losing himself by actually killing people.

The End

Su-Yun is student in college. She meets a boyfriend, Jun, in school. They love each other but Su-Yun has a secret. She has been in forced into a sexual relationship with her stepfather, Kim Yong. Jun tries to help Su-Yun to escape her father but Kim Yong attacks Jun and tries to keep Su-Yun. Jun goes to Kim Yong's house and fights with him.

Dogpa

Just when So-Ri is about to break down, a stranger enters her life. He seems to know all her secret fears, doubts and hopes. Unable to stop herself, So-Ri follows him to a place from which there might be no coming back…