Hong Kong police agent Cheung (by Aaron Kwok) works undercover in Kang's (by Sean Lau) drug cartel. For years, he assists the notorious Thai-Chinese military veteran in operating the syndicate out of South East Asia before moving to Hong Kong. Following the trail of information left by Cheung, Superintendent Au (by Louis Koo) leads the Nar cotics Bureau to bust the syndicate, but Cheung is heavily wounded and saved by Kang in the ex change of fire which follows. The two subse quently hide away in an opium-growing village somewhere in the Golden Triangle. Helped by a local Chinese girl, Noon (by Yang Cai Yu), Cheung is on his way to recovery while Kang bands together with the militia leader Dai (by Lo Ka Leung) to rebuild his narcotics empire.Out in the remote wilderness, Cheung is cut-off from the out side world, but as soon as he re-establishes con tact with Au, the superintendent enlists Interpol's help and sets off to the Golden Triangle to bring his fellow back. On the streets of Thailand, Cheung reunites with Au amidst the shootout unleashed by the law en forcers and members of the cartel, who then in forms him of the Thai military's imminent crack-down on Dai and that he is to revert back to the life of a cop in Hong Kong. However, refuses to leave Noon behind, Cheung hurries back to the lawless village one last time with Au. Word travels fast, and it isnʼt long before Dai receives a tip-off about Cheung's betrayal... What emerges in the frontline of war is a familiar face, but this time, as a friend or foe?