In the evening, YAN visits MAN secretly. He persuades MAN to become an undercover agent for the police and carry out investigation on XIAO. FOOK TIN is suddenly trapped in his sauna room. XIAO and TONG rescue him from the room and they threaten him to return the debts. CHIU meets KIU and BO on the hill. He challenges BO to a running contest. Encouraged by KIU, BO accepts the challenge but she becomes exhausted in the middle of the contest. CHIU voluntarily teaches her the technique of running. SUM meets her mother while shopping in a supermarket. OI goes to SUM’s home to teach her cooking. CHIU discovers some suspects. After reporting to the police control room, the suspects suddenly abduct him. KIU and BO rush to the scene to rescue CHIU and they start a gunfight with the gangsters… On the other hand, the police discover that MAN has helped XIAO deliver drugs before and he is finally dismissed from the police force…