I Saw the Devil - 2010

Kyung-chul is. He has committed infernal murders from ways that were diabolic this one cannot really imagine and his sufferers range to children between young women. The police have chased him for a long period, but were struggling to grab him. Joo-yeon, daughter of a retired police leader becomes his victim one day and can be found dead at a state. Her, a top secret agent, decides to track down the murderer himself. He promises himself he is going to do everything in his ability to take vengeance against the killer, so even if this indicates he has to turn into a monster himself to get this killer that is inhumane and colossal.