緝毒隊四兄弟泰樺、老米、阿峰、阿棠曾參與抓捕毒梟老爹，行動前上交電話以防竊聽。然而，因黑警洩密，他們陷入圈套，阿峰遇難，盧sir犧牲，阿棠消失，泰樺與老米關係緊張。為揭真相、剿滅毒梟，二人分道對抗，在忠誠與背叛、正義與邪惡間掙扎，緝毒警察內部暗流湧動，正義之戰難見終局。
The four brothers of the anti-drug team—Tai Hua, Lao Mi, A Feng, and A Tang—once participated in a mission to capture the drug lord "Old Dad." Before the operation, they handed in their phones to prevent eavesdropping. However, due to a corrupt cop’s betrayal, they fell into a trap. A Feng was killed, Inspector Lu also lost his life, and A Tang disappeared, leaving tension between Tai Hua and Lao Mi. To uncover the truth and destroy the drug cartel, the two went their separate ways, struggling between loyalty and betrayal, justice and evil. Amid internal conflicts, the battle for justice faces an uncertain fate.