KONG SAI HAU (Miu Kiu Wai, Michael) is released from jail in Taiwan. He returns to Hong Kong immediately and tries to find his daughter KONG YAU YAU (Kong Yeuk Lam, Elanne) so as to heal their relationship. By pretending to be friendly with the one who made him in jail, the gang leader TO YIK TIN (Lam Lei), Hau is eager to get even with him, and also intends to draw two young policemen to his side in order to strengthen his influence. LEE PAK KIU (Chan Kin Fung, Sammul) from the Emergency Unit is reluctant to get close with a gangster while CHUNG LAP MAN (Ng Cheuk Hei, Ron) from Special Duty Squad believes that Hau could help them fight against Tin by acting as an informer. MAN develops a close relationship with him gradually but he has been dismissed before accomplishing the task. Afterwards, Hau takes Man under his wing and Man devotes himself to the triad society.
Tin always put Hau on his guard and he asks his trusted follower LEUNG SIU TONG (Tse Tin Wah, Michael) to keep a close eye on Hau. On the other hand, Hau fights back by making use of TIN's wife CHING YEUK SAM (Chow Hoi Mei, Kathy) to strengthen his power in the gang. Hau eventually becomes the gang leader and he believes that everything is under control. However, the drug trafficking business keeps running into trouble abnormally. Hau begins to question the loyalties among his confidants.