When Jung Sun-jung's young daughter is raped and murdered she is left traumatized and sets about punishing a series of apparently random yet unpleasant people who she feels have wronged society. As the victims begin to mount up, two police officers, one a young rookie, the other, Jung Sun-jung's ex-husband whose personal involvement threatens to derail the case must track her down before she kills again.

As the police close in on her and the real reasons for the killing spree become clear the films reaches its thrilling climax and keeps you guessing right to the very last shot.