Two sisters who, after spending time in a mental institution, return to the home of their father and cruel stepmother. Once there, in addition to dealing with their stepmother's obsessive and unbalanced ways, an interfering ghost also affects their recovery.
A serial killer named Shin-Hyun gives himself up to police. He confesses to committing a series of particularly horrifying murders of exclusively female victims. He is imprisoned, awaiting the death sentence for his crimes. Yet the killings do not stop. They continue with all the same characteristics trademarks of the Shin-Hyun serial killings. The case is re-opened when two more bodies are discovered.
Jang Kyung-chul is a dangerous psychopath who kills for human meat. 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 fiancé Soo-hyun (Lee Byung-hun), 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.