At the Happy Dragon Recreation Park, Hong Kong's two notorious drug lords, Hon San (Wong Wai) and Chai Yan (Lau Siu-ming) leads their respective group of underlings carry out a huge drug trade. Police superintendent Tsang (Alex Man) leads chief inspector Tong Fung (Sibelle Hu), Man (Candy Wen) and other sergeants and laid a dragnet for a cleansweep of the two trug traffickers. However, during the drug trade, the ambush by the police was exposed by Chun Bing (Moon Lee), a master of multiple identities, and Chai Yuet (Ray Lui), a tough, ruthless fighter, both of whom engage in a fierce gun battle with the police. Hon believes the incident was a result of Chai betraying him and tipping the police. As a result, Hon's his right hand man, Chiu Sing (Francis Ng), to murder Chai, while Chai's son, Yuet, swears vengeance.