Leung Yan Tung

Beaten down by the gangster for the last time, Parking attendant Chan Yiu-Hing opens a security business and becomes an underworld hero himself. When his girlfriend wants to settle down, Chan realizes he can't outrun his past.

Ling-wu Chung, a senior student of the Wah Mount Sect, was not at all brilliant when he joined the Sect, but was soon taught to master the sword by a legendary swordsman Yeung. Chung’s master, Kwan, resented this and drove Chung away. In order to get hold of “Kwai Fa Bo Din”, the book on the most powerful martial art, Kwan diverts attention by secretly creating troubles everywhere. Chung, on the other hand, becomes the leader of the Hang Mount Sect by chance and falls in love with Kwan's daughter. When she betrays him, he turns to the daughter of the Devil Sect leader, and thus causes a love triangle between them.

Kan Yiu-yeung, Ku Ka-keung, Kiu Po-po and Kiu Tai-nam were once CTRU’s Formidable Quartet. An incorrect decision in an operation caused the breakup of their friendship. And the quartet went their separate ways. Fast-forward to the present and an indiscriminate homicide again brings the quartet together. But there are still certain unresolved issues between themselves. POTT is Counter Terrorism Intelligence Cadre’s other elite task force. Team leader Fong Kwok-hei admires Po-po and asks her to become her subordinate. Team member To Siu-jie fancies her partner Yiu-yeung and finds out Po-po is Yiu-yeung’s ex-lover, so she “starts a war”. Successive explosions happen in the city. While investigating, Po-po asks prisoner-cum-hard criminal Dr. Hong’s for help, and the process is surprisingly easy. Actually, Dr. Hong has some trick up his sleeve.

Former friends Kwok Pak-fei, Keung Hei-man, and Lau Lik reunite years after a botched operation led to a tragic death and estrangement. Now, a gruesome murder case tied to a human trafficking ring forces them to work together. As they investigate, mysterious messages appear with clues about the crimes, hinting at knowledge from the future. Together, they form a special unit, ASIB, to decode these messages and solve the chilling case.

Gordon Heung and Wai Sai-Lok have been long-time collaborators in the police force, frequently working with each other to solve drug trafficking cases in the city. During an operation, Sai-Lok discovers clues that point to Gordon being a corrupt cop in a collusion conspiracy with drug dealers. Suspicious about Gordon's true intentions, Sai-Lok launches a secret investigation on him.