Life is not the most fulfilling for sixteen-year-old Meng: Lounging at home with his grieving father on a daily basis, being excluded from his family’s past, and forced into bullying other kids at school. Everything changes when he is thrown into a life-altering adventure that propels him into an exciting unfamiliar landscape.

Ten years ago, Tong Waichong and Shum Aoming joined the ICAC together. They were trained together and they were brothers. Aoming was injured in a private act, and he resigned soon after, and has not been heard from since. Ten years later, Waichong has been promoted to the chief investigation officer, and led his subordinates such as Lee Zhunyi to maintain integrity and justice. When Waichong investigates a suspected bank employee corruption case, he discovers that Aoming is involved. It turned out that Aoming, relying on his past investigation experience in the ICAC, helped the criminal group to avoid the investigation of various criminal and anti-corruption agencies for many times. Waichong is distressed that his friend forgot his original intention of joining the ICAC to defend fairness and justice, and vowed to bring the criminal group to justice!

An ultraviolent cops vs. gangsters bloodbath leaves casualties on both sides. Twenty years later, surviving team member Madam Fong leads a new squad in pursuit of reckless young anarchists terrorizing Macao.

Two police pursuit drivers, a hothead rookie and his long-suffering, almost-retired mentor, face off against an escape car driver from the latter's past.

Champion competitive marksman Ken comes across an armored van robbery. He sees a policeman held hostage and shoots and kills four of the robbers. One of the robbers escapes and the policeman survives. The case is handled by Jerry Chang, whom Ken knows from having recently beaten him in a shooting match. Ken is found not guilty in court. Soon after, Ken is attacked by the escaped robber Pang Tao. Their confrontation reveals a very different background story and brings about a myriad of lies and traps and changes in relationships as Jerry and Ken try to outsmart each other.

Sergeant Tong is wracked with guilt after he unwittingly kills a young girl whilst capuring a criminal named Cheung. When the girl's sister is later kidnapped in a ploy to get Cheung released, Sergeant Tong vows to find and rescue her before she comes to harm.