

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.
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Trailer
I Saw The Devil Trailer
Where to Watch(AU)

Streaming data provided by JustWatch via TMDB.
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
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