SAI-LOK asks HEI-SUEN to keep an eye on Granny CHOI but HEI-SUEN carries out investigation on YAT-MING secretly. SAI-LOK and HEUNG WING wait for a long time but YAT-MING doesn’t arrive. HEI-SUEN suddenly reports that Granny CHOI is missing. HEI-SUEN rescues Granny CHOI but she falls down from the building. YAT-MING finally discloses his relationship with YAU-YEE’s mother to the police. However, in order to protect his wife and daughter, he refuses to disclose the name of the drug lord. HEI-SUEN has a bad mood because of her father. She invites KA-PIK and TAK-TIM to drink. The police believe that the tycoon CHIU CHI-FAI is the drug lord. SAI-LOK and the others monitor his telephone conversation. They discover that CHI-FAI is talking with the Columbia drug dealers. CHI-FAI escapes successfully while trading with the Columbia drug dealers. SHUI-KI asks SAI-LOK out for he suspects that there are dirty cops in the team.