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Lao Wang (played by Ren Dahua), Snow Ling (played by Cheng Yu-Ling), Dragon Boss (played by Leung Ka-Yin), and Uncle Da (played by Wu Meng Da) are all narcotics officers who fight side by side, sharing hardships and joys, and have formed deep bonds of friendship. One day, they dismantle a drug den, but the drug lord manages to escape. Subsequently, the drug lord kills Dragon Boss, and the remaining officers vow to find the drug lord and avenge Dragon Boss. One day, Ah You (played by Andy Lau) accidentally discovers that Uncle Da is colluding with the drug lord and records it on video as evidence. Ah You tells his trusted friends, Ah Dan (played by Donnie Yen) and Lao Wang, but it turns out that Lao Wang is also working with Uncle Da. To eliminate the evidence, Lao Wang kills Ah Dan and frames Ah You. Ah You's girlfriend, Ah Mei (played by Wan Bi Xia), discovers the fatal video tape. In an attempt to save Ah You, Ah Mei is also killed by Lao Wang, but this act inadvertently exposes Lao Wang's hidden involvement.