While investigating a sexual assault, police constable MOK TSOK-TUNG is mistaken by LI WAI-WAI, an insurance broker, for the sexual offender. Along their way to catch the suspect, TUNG has an asthma attack. Basing on the clothing of the sexual offender, TUNG has arrested four suspects. His supervisor SZE KO-BUT suggests conducting a crime scene investigation, through which TUNG discovers that the victim is not WAI but somebody else. He has then devised a plan to make the sexual offender turn himself in. WAI’s supervisor SIMON LEUNG invites her to his home after work so that they can have better preparation for the meeting with a significant client on the following day. This has puzzled WAI beyond measure. WAI goes to buy some beauty products at a cosmetic shop, where she and other customers are suspected of stealing an item. Coincidentally, TUNG is sent to investigate the case.… ...