A psychotic serial killer is on the loose, committing some of the most diabolical crimes the police have ever witnessed. No one is safe as the body count rises and the killer continues his evil odyssey of sadistic butchery. But when the fiancée of an elite special agent becomes one of his victims, a personal investigation becomes a merciless and brutal game of vengeance. As one violent encounter leads to another, it's a game where the hunter becomes as unhinged as the hunted.directed by one of korea's most notorious and revered directors kim ji woon a tale of two sisters, i saw the devil is as action packed and thrilling as it is extremely dark and disturbing. Reuniting the director with actor lee byung hun a bittersweet life, hero it also stars asian cinema legend choi min sik oldboy.special featuresdirector's commentarydeleted scenestrailerstill gallery