SIN WAI-YING from the Organized Crime and Triad Bureau (OCTB) is requested to carry out investigation at the crime site. WAI-YING discovers the murderer and finds the offender successfully. Police CHEUNG LAP-FUN immediately chases after the offender alone. In order to stop the offender from firing his gun, LAP-FUN creates a traffic accident and an innocent civilian is seriously injured. Five years later, LAP-FUN becomes a probationary inspector and he joins the OCTB. He carries out investigation on the gang leader LAU YIM with his partner NG SHING-YEE. LAU YIM’s younger sister LAU MIU accidentally provokes some gangsters at work and her good friend TAM MEI-CHING rescues her. MEI-CHING is LAU YIM’s girlfriend and she works at a brand name shop. Her colleague YIP YING-SUM is her good friend. After accompanying MEI-CHING for a drink at the pub, YING-SUM is not able to work on the next day and MEI-CHING replaces her……