Joyce Chan Ching-yee (Kathy Chow), a 28-year-old superintendent of the Homicide Bureau. While investigating a horrific rape-murder, she immediately recognises the killer's modus operandi — it's the same one used by the man who murdered her mother 23 years before. Chan's investigation leads to the capture of Lee Chun-min (Sam Lee (actor)), who confesses to the murder of Chan's mother and several other women. Lee was arrested years before, but was released without a trial. As Lee is only 23, Chan is convinced an older serial killer is still on the loose, but the investigation come to an abrupt halt when Lee kills himself.