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.

A washed-up action choreographer, struggling to find his way in a changing industry, risks everything to stage an epic comeback, and attempts to repair the relationship with his estranged daughter before it's too late.

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?

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.

“Once clothed as an official, you represent law and justice.” This was taught to young detective Xian who worked under Detective “Silent Dog” Ao to catch mountain robbers. To everyone’s dismay, the robbers turned out to be detectives from neighbouring counties who were forced to rob the ruling county to save the poor. Through trickery and lies, Ao started a bloodbath to kill the robbers. Shaken to the core by Ao’s deceit, the originally naïve Xian abandoned his dreams to uphold righteous values. Not to be outdone, he ended up murdering the treacherous Ao for his own gains. With blades and blood, Xian was later hailed as a legendary detective.

A renowned charity foundation is holding its annual charity party. It’s a glamourous meeting of the foundation’s friends, associates and the city’s most elite socialites. Just as foundation chairman Ko Shing Man is about to give his annual speech to the attendees, Yeung To – the foundation’s chief financial officer - suddenly hangs to his death on the stage. As suspicions surround Yeung’s death, rumors of a missing $200 million charitable donation begin to run rampant, attracting the attention of the masses. The mystery brings barrister Ma Ying Fung and police officer Or Ting Bong together as they form a temporary partnership to uncover the truth behind the foundation’s dealings. Can they expose all the dark truths behind the foundation’s wrongdoings and restore justice?