When Fung's cop boyfriend Tats puts her supposedly reformed triad father behind bars, her daughter Fung aims to rid the organization of it's dirty ties, but one of Fung's father chief goons, Cheong, plans for a very hostile takeover.
While conducting a raid of an illegal arms deal, detective Mew Mew discovers the body of a dead woman and her daughter who witnessed the murder. Believing that the girl may be in danger, Mew Mew seeks out her aunt Cher, and the three develop a bond, but Cher's ex-husband and a vengeful gunrunner soon show up to disrupt their short-lived peace.
A young schoolgirl, Yuen Fong becomes caught in a tragic stranglehold of triad activity after she testifies in court over a triad beating. When this news reaches the triad leader Brother Smart, Yuen Fong must pay him protection money for what she has done as events begin to escalate.
Sergeant Kwok Wah (Andy Lau) and Ho Lung (Ray Lui) are both colleagues and best friends. Ho Lung has developed hatred with a gang leader Dick. Dick sends Hung (Cherie Chung) as a bait to kill Ho Lung. Swore to take revenge for his best friend, Kwok Wah works with Ho Lung's partner Mother (Kent Cheng) to unveil the enemy. Kwok Wah saves Hung during an operation and Hung starts to like Kwok Wah. Kwok Wah and Mother follow their plan to capture Dick, but it ends in vain and both of them get into a gunfight. Hung is killed for saving Kwok Wah during the gunfight. Though heart-broken, Kwok Wah and Mother go on fighting the villain...
Lo Ka Yiu, a young ad designer who is sentenced to jail for manslaughter, has gotten himself in trouble with the corrupted wardens and fellow inmates of Triad background. Chung Tin Ching, a veteran inmate and Yiu's mentor, is forced to confront his comrade's enemies time and again, leading up to the final showdown with the head of security.
Ko Chow is an undercover cop who is under pressure from all sides. His boss, Inspector Lau, wants him to infiltrate a gang of ruthless jewel thieves; his girlfriend wants him to commit to marriage or she will leave Hong Kong with another lover; and he is being pursued by other cops who are unaware that he is a colleague. Chow would rather quit the force, feeling guilty about betraying gang members who have become his friends.