- Andy, Miu, Tony and Felix are CID members under the leadership of sergeant Leung. The group of five are well co-operated and has solved many difficult cases. Moreover, they have established a kind of fraternal love out of this teamwork. During the investigation of a drug trading case, Sergeant Leung and his team is discovered by the smugglers Chan, Lo and Ken. A gunfight starts and Miu is injured.
The smugglers flee and leave five million dollars. Several months later Felix finds out that the other team member have taken that money and have already divided the money among themselves. Considering the safety of other team members. Felix keeps his mouth tightly shut. After the unsuccessful blackmail to the five cops, ken reveals the truth to ICAC and becomes their witness. Shameful of himself, Sergeant Leung commits suicide...