I Saw the Devil (2010)
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 take vengeance against the killer, even if it means that he must become a monster himself.
Cast
Lee Byung-hun
Kim Soo-hyeon
Choi Min-sik
Kyung-chul
Jeon Kuk-hwan
Squad Chief Jang
Cheon Ho-jin
Section Chief Oh
Oh San-ha
Joo-yeon
Kim Yoon-seo
Se-yeon
Nam Bo-ra
Section Chief's Daughter
Lee Jun-hyuk
NIS Agent
Yoon Chae-yeong
Nurse Han Song-i
Choi Moo-seong
Tae-joo
Kim In-seo
Se-jung
Kim Kap-soo
Planning Team Deputy Head
Um Tae-goo
Detective
Choi Jin-ho
Planning Director
Jo Deok-jae
Detective Kang
Park Seo-yeon
Woman at Pension
Lee Seol-gu
Gangster in Taxi
Kim Jae-geon
Old Doctor
Park Ji-yeon
Teacher
Son Young-soon
Kyung-chul's Mother
Han Chul-woo
Detective Park
Park Jeong-gi
Sergeant
Kim Bong-soo
Kyung-chul's Father
Kim Kang-il
Park Han-gi
Seol Chang-hee
Detective
Yoon Byung-hee
Jang-goo