I Saw the Devil
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.
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
Mi-nam Jeong
Gangster in Taxi
Jo Deok-jae
Detective Kang
Jang Jeong-won
Kyung-chul's Son
Park Seo-yeon
Woman at Pension
Lee Seol-gu
Gangster in Taxi
Kim Yeong-chan
Young Pharmacist
Goo Yong-wan
Corporal
Kim Dae-hye
Hospital Worker
Kim Jae-geon
Old Doctor
Park Ji-yeon
Teacher
Son Young-soon
Kyung-chul's Mother
Nam Hyeon-joo
Section Chief Oh's Wife
Han Chul-woo
Detective Park
Sin Jeong-hoon
Policeman at Stream
Han Se-joo
Woman on Bus
Park Jeong-gi
Sergeant
Jo Myeong-yeon
Detective
Kim Bong-soo
Kyung-chul's Father
Kim Kang-il
Park Han-gi
Sin Sin-Beom
Old Pharmacist
Seol Chang-hee
Detective
Yoon Byung-hee
Jang-goo
Jung Tae-sung
Hotel Agent
Jang In-seo
Student