I Saw the Devil (2010)

2h 24m South Korea

Plot

Kyung-chul, a ruthless psychopath, revels in his violent acts. When his fiancée becomes one of his victims, Soo-hyeon, a secret agent, embarks on a relentless quest for revenge. Fueled by grief and fury, he delves deep into a dark world, vowing to confront the killer at any cost. As Soo-hyeon transforms, he grapples with the moral implications of his brutal pursuit, blurring the lines between hunter and hunted. In this chilling tale of vengeance, the quest for justice pushes him toward becoming the very monster he seeks to destroy.