In 1970s Hong Kong, the Independent Commission Against Corruption (ICAC) was formed to bring down the corruption syndicate led by British government officials. One of its top investigators is Senior Investigator Lau Kai-Yuen, who brought down countless corrupted officials. Just as he thought stability and prosperity are within reach, a new era of greed and riches takes him into a new battlefield of corruption.

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.

“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.

Chan Hotung - The ex-leader of gangster group "Dragon of the Four Seas" in Mongkok. After the years he quit and work in the car shop with low wages without dignity. Somehow, his old enemy Kurou has become the CEO of Technology company "EastStar", Kurou lead a Cyborg soldier “Iron Head” to persecution the old Gu Wak Zai include Hotung and his old brothers. To defeat an invincible enemy, Hotung decided find one man to help - The Hong Kong Master, the legendary man who merges technology and Feng Shui together. With two magician weapons Quantum Blade and Thunder Cannon from Hong Kong Master, Hotung and his brothers put their lives on defending their homeland and beat those Iron Heads. The Ultimate HongKong Sci Fi battle has begun !