In the underground racing scene, emerging racer Xiao Le spirals into despair after an accident during a race with his brother, A Chieh. His life changes when he meets doctor Hui-Hui and becomes an ambulance driver, vowing to save people with speed. However, fate complicates things as San Pao and underground racing leader Brother Ben investigate, uncovering the unexpected truth about A Chieh.
Ever since he was a child, Lee Chi-kin has been determined to become a police officer, despite the fact that he comes from a family of criminals. As an adult, he joins the police force, where he is first placed with the Narcotics Bureau. During a drug raid operation, he catches a drug dealer. He is later transferred, first to the Anti-Porno Bureau where he falls in love with a call girl, then to the Regional Crime Unit where he works under Inspector Chu. During a drug raid operation, Lee kills drug lord Ng Cheung. Ng's father hires a killer, Thousand Faces Man to take revenge on Lee. After several confrontations, Lee finally brings Thousand Faces Man to justice. The corrupt director of a mental hospital places Lee in the mental hospital for a year, during which time he develops mental disorders. After being discharged from the hospital, he becomes a restaurant waiter.
Hong Kong Police Supt. Walter Tso arrests Big Dai, the reformed leader of a criminal corporation. When Dai asked his brother Richard Mao to turn himself in to the police, he betrays him and decides to take over the corporation. Dai is imprisoned and an informant is murdered by one of Mao's men. With no evidence against Mao and the corporation, Tso coerced four of the "Five Lucky Stars" to go undercover in the prison, rescue Dai, and help nab Mao and bring down the corporation
