I Saw the Devil (2010) is a Thriller, Horror film that follows 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. Currently, you can watch I Saw the Devil on Philo, Google Play Movies. Streaming availability may vary by country and platform over time. It has a user rating of 7.8 out of 10 from 3,044 votes. Fans of thriller movies may also want to explore similar titles below.