With MON's assistance, NAY and YAN go to a discotheque to find a man named SAM. However they are surprised to find that SAM is CHI. CHEUNG learns from HIN about NAY's job and goes to find her. For her duty, NAY scolds CHEUNG. The others do not suspect her. HIN meets NAY and YAN in air hostess costume. He spoils their plan by disclosing that they are working as spies. He promises not to tell the others. Instead he goes to the discotheque to protect them. NAY is impressed. NAY and YAN win BOB and CHI's trust. BOB and CHI visit their home suddenly and MING is there. MING clams that he is YAN's boyfriend. They go to dine together. YAN eats BOB's soft drugs and this makes BOB trust her.