Overview: MAN-KIT discovers that SING-YEUNG is sending the drunken YAN YIN home and he is very nervous. He asks HAK-LOI to carry out investigation on SING-YEUNG. On the other hand, TIN-LAM, KA-KEI and KING-CHIU discuss about the accidents recently. HAK-LOI discovers that SING-YEUNG was an outstanding student and YAN YIN admired him secretly. TIN-LAM goes to the locker at the shopping mall to collect his bag. Besides cash, he discovers a girl's photo inside. SING-YEUNG invites YAN YIN to attend the schoolmates gathering. When they leave the restaurant, YAN YIN questions him why he has disappeared for four years ago. A middle-aged man suddenly falls down from above. The police discover that the dead man TSE TUNG-LAM is the boss of a construction company. YAN YIN is responsible for investigating the case and YAT-MING is investigating the water logging at the warehouse. YAT-MING goes to the warehouse to investigate the reason for water logging.… ...