Plot: Cheng Tian, ​​Wei Jun Xuan, and Xu Xiu Ping grew up like brothers, and the three loyal friends join the HK Police Force together, specializing in anti-narcotics cases. While they were meant to reunite after busting a large-scale drug ring, Cheng Tian and Xiu Ping discover that Jun Xuan, who had gone undercover, has returned a changed person