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You can stream I Saw the Devil (2010) on Philo with a subscription.

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.

Forget the typical cat-and-mouse chase, as this relentless pursuit turns into a mutual cycle of sadistic cruelty. A grieving agent hunts a serial killer not to capture him, but to break him through calculated, bone-chilling retaliation.

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