KAM’s sister LAW BING was GUCCI’s best friend and classmate. From a photo GUCCI took with her boyfriend KAM WAH, KAM deduces that GUCCI was the mistress of his brother-in-law and the very murderer of her sister. When KAM finds out that GUCCI, a pro who rids of a person without a trace, hatches a murder plan that targets at him, he tells KITTY. A series of events seem to confirm his suspicion that GUCCI has killed BING: she enters his room stealthily, seeks advice from BOON YAT SIN, and makes a confession of guilt.