Lung Ying (Ko Chun-hsiung), patriarch of the Lung family and leader of the four Triad families, have decided to stop dealing in drugs and go straight with legitimate business. While the No. 3 and No. 4 of the four families follow suit, White Wolf (Ku Feng), the No. 2 of the four families, continues his illegal dealings and Lung sends his hitman and adopted son, Allan (Alan Tam), to kill Wolf's underling, Golden Teeth Shing, who is in charge of Wolf's drug business, before sending Allan to Taiwan to hide from the police. When Wolf finds out what happened, he is enraged and calls his second in command, Tsui (Norman Chui). At this time, Kui (Ho Ka-kui), Wolf's underling and the accountant of the four families, pleads with Lung to spare him when HK$5 million was lost, but it turns out Kui was colluding with Tsui. Meanwhile, Lung's second son, Ka-yip (Kent Tong), is in debt to Wolf after losing in his casino so Tsui and Kui lures him to help them ship cocaine since he is in charge of Lung's container terminal.
While the Lung family is sending off the fifth and youngest son, Ka-chung (Max Mok), to study medicine in England, Tsui and Kui set a trap on Ka-yip to give Wolf a reason to capture Ka-yip and lures Lung out to a meeting with the other patriarchs of the four families at Wolf's wood factory in Cha Kwo Ling. Lung arrives at Wolf's factory with his bodyguard, Po (Kent Cheng), while his brother-in-law, Sek (Lau Kar-wing), stays in the car. There, Wolf demands Lung to kill Ka-yip on the spot, but Lung stabs himself instead as he believes his son was framed and demands two days to investigate the matter, but Wolf refuses. Kui stirs up the scene but Lung then slaps and accuses him for the HK$5 million. At this time, Lung's eldest son, Ka-wai (Michael Miu), arrives and impulsively enters the factory followed by Sek, and beats some of Wolf's henchmen before Kui takes a knife and holds Lung in the neck, demanding Ka-wai and Sek to take off their pants. Ka-wai then throws his pants at Kui, who struggles with Lung before stabbing the latter in the chest.