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"He who fights with monsters should look to it that he himself does not become a monster. When you gaze into an abyss, the abyss also gazes into you."-Friedrich Nietzsche

Kyung-chul (Choi Min-sik, OLDBOY) is a dangerous psychopath who kills for pleasure. He has committed infernal serial murders in diabolic ways that one cannot even begin to imagine and his victims range from young women to even children. The police have been chasing him for a long time, but unable to catch him. One day, Ju-yeon, daughter of a retired police chief, becomes his prey and is found dead in a horrific state. Her fianc Soo-hyun (Lee Byung-hun, A BITTERSWEEET LIFE), a top-secret agent, decides to track down the murderer himself. He vows to 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 the monstrous and inhumane killer.

Extras:

NEW! Audio commentary by author and filmmaker Kat Ellinger

"Making of" featurette

Interviews with Cast & Crew

Deleted Scenes

Raw and Rough: Behind the Scenes of 'I Saw the Devil' featurette

Trailer