I Saw the Devil

Kyung-chul is a dangerous psychopath who kills for pleasure. He has committed infernal serial murders in diabolic ways that one cannot even imagine and his victims range from young women to even children. The police have chased him for a long time, but were unable to catch him. One day, Joo-yeon, daughter of a retired police chief becomes his prey and is found dead in a horrific state. Her fiance Soo-hyun, a top secret agent, decides to track down the murderer himself. He promises himself that he will do everything in his power to take bloody vengeance against the killer, even if it means that he must become a monster himself to get this monstrous and inhumane killer.I Saw the Devil featuring Lee Byung-hun and Choi Min-sik is streaming with subscription on Hulu, free on Tubi TV, streaming with subscription on Monsters and Nightmares (Via Prime Video), and 10 others. It's an action & adventure and crime movie with a high Rotten Tomatoes (critics) score of 80% and a high IMDb audience rating of 7.8 (92,936 votes).