A serial murderer has brutally killed several policemen and their pregnant wives. After a quick investigation, the murderer is revealed to be Kit, whom the case's detective-in-charge knows from a previous case. Once upon a time, Kit was an innocent boy in a rural village who also has a crush on naïve high school student Wing. After the death of Wing's grandmother, Kit rescues Wing from a foster care facility, and the two quickly fall in love. However, their romance ends prematurely when a local policeman arrests them. The events that follow lay the seeds for Kit's terrifying path to vengeance.

A retired British Chinese soldier, a young South Asian man, an encounter at Chungking Mansions. Coincidentally, they both offended the same gang boss. What has given them a new lease of life and how do they rediscover themselves through each other's company.

Following his confrontation with the nefarious DOA organization, Ken (Chow Yun Fat) is looking forward to going back to enjoying his retirement. His rest is cut abruptly short when his protégé Vincent (Shawn Yue), who's now working for Interpol, asks for Ken's help in taking down the real mastermind behind DOA, Aoi. The two head to Thailand, where DOA's former chief accountant Mark (Nick Cheung) has escaped with his daughter.

In 1980s Hong Kong, troubled youth Chan Lok-kwun, a mainland refugee, struggles to survive in the Kowloon Walled City by joining underground fights. Betrayed by crime boss Mr. Big while trying to buy a fake ID, he steals drugs from him and seeks refuge in the Walled City, where he encounters Cyclone, a compassionate yet authoritative crime lord.

While undercover officer Kit is taken prisoner by the syndicate, he befriends his keeper and discovers an organ trafficking ring.

After suffering life changing injuries in the line of duty, bomb disposal officer Fung turns his back on the police. But when a devastating series of bombings sweep Hong Kong, the police suspect their former ally may be involved after he is found unconscious at a crime scene. Now faced with memory loss and recalling only fragments of his former life, Fung sets out to uncover the truth and find out who he really is.

When a terrorist who specializes in explosives takes hold of an underground tunnel, he threatens to kill hostages if his demands are not met.

The details of undercover police officers are deleted from a police database and a senior officer is left struggling to know who are the undercover officers and who are the criminals.

Hong Kong Customs and Excise Department officers Chow Ching-lai and Cheung Wan-nam share a close mentor-student relationship. On a case involving seized smuggled arms, Ching-lai is sent to take part in a joint operation with Interpol to capture a reclusive arms dealer. However, Wan-nam makes a drastic decision that further complicates the case.

A chief inspector in the anti-narcotics unit holds true to his beliefs as a police officer. He puts everything on the line to crack down on drugs and to bring drug traffickers to justice. How will our hero resolve this "bursting point" crisis?