I Saw the Devil (2010)

Cast: Lee Byung-hun, Choi Min-sik, Jeon Kuk-hwan, Cheon Ho-jin, Oh San-ha, Kim Yoon-seo, Nam Bo-ra, Lee Jun-hyuk, Yoon Chae-yeong, Choi Moo-seong

Kyung-chul is a dangerous psychopath who kills for pleasure. Soo-hyeon, a top-secret agent, decides to track down the murderer himself. He promises himself that he will do everything in his power to t…