I Saw the Devil (2010)

I Saw the Devil (2010) is a South Korean psychological thriller that follows a chilling cat-and-mouse chase between a secret agent, Kim Soo-hyeon, and a sadistic serial killer, Jang Kyung-chul. After Kyung-chul brutally murders his fiancée, Soo-hyeon embarks on a relentless quest for revenge. However, instead of ending the killer’s life, he engages in a twisted game of vengeance, continuously torturing him in increasingly brutal ways. As the line between justice and madness blurs, the film explores the depths of human cruelty, revenge, and the psychological cost of seeking vengeance. The gripping plot and intense action make it a must-watch for thriller lovers.