Patrolman Chan Chun Kit (Eason Chan) in Wan Chai District has lost his passion for the police because he has been doing the same routine work every day for seven years. When his junior sister Liao De Nan (Joey Yung) is sent to patrol with him, he sees her enthusiasm and seriousness, and he will sneer at her from time to time. When he meets the lunatic Wang Cheng (Francis Ng), Chan Chun Kit only treats him as a mental patient and points him to Liao De Nan. After meeting Chan Chun Kit in a bus passenger's exposed weapon case, the 19-year-old innocent girls Nicole and Diet begin to admire Chan Chun Kit, and Chan Chun Kit also feels the warmth from the two. Soon, a brutal rapist appears in Wan Chai District, and many single women are raped and killed by him, and Diet is not spared. This incident wakes Chan Chun Kit up from his numbness, and he begins to hunt down the murderer like crazy.