Yoonbum's obsessed with a popular Sangwoo till he became a stalker, trespassed into his house. But Sangwoo who's empathetic, considerate & gentle turned out to be a psychosis criminal; kidnaps, detains & tortures victims till death. He also killed his own parents 3 years ago.
Yoonbum just jumped into the psychosis criminal's hands.
Killing Stalking