A suspected criminal mastermind escapes from police custody, throwing the city into turmoil. With the police department now divided, rival police chiefs are forced to take their fight to the streets of Hong Kong with deadly consequences.
Set in the 1980s, troubled youth Chan Lok-kwun accidentally enters the Walled City, discovers the order amidst its chaos, and learns important life lessons along the way. In the Walled City, he becomes close friends with Shin, Twelfth Master and AV. Under the leadership of Cyclone, they resist against the invasion of villain Mr. Big in a series of fierce battles. Together, they vow to protect the safe haven that is Kowloon Walled City.
Water Ng, a typical loser who likes to gamble and takes no responsibility is asked to take care of his ex-girlfriend Jik’s son, Yeung. With Jik tells him that Yeung is his son, and promised 100 thousand dollars, Water Ng agrees to be a father for one month. Soon he notices his son has Autism. He gets to understand the difficulties of raising a child along with special needs. With Jik's absence on the agreed date, Water Ng realizes why she brought him his blood. He finds his life goal while discovering Yeung’s talent on the racing field, then decides to get rid of the dissipated life and accompany his son spreading wings for the dream.
Kwok plays a cyber security engineer who develops an AI programme with the potential to disable the region’s entire networks, but then has to prevent it falling into the wrong hands.