On a freezing, snowy night, a dangerous psychopath's latest victim is the beautiful Ju-yeon, daughter of a retired police chief and pregnant fiancée of elite special agent Soo-hyun (The Good, The Bad, The Weird’s LEE Byung-hyun). Obsessed with revenge, Soo-hyun decides to track down the murderer, even if doing so means becoming a monster himself. And when he finds Kyung-chul, turning him in to the authorities is the last thing on his mind.