Hong Kong's three notorious thieves who have never met one another before appear in the same restaurant. This leads to a rumour that they are joining forces to pull off something big before the Handover, though this is not something that any of them.

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.

A friendship is formed between an ex-gangster, and two groups of hitmen – those who want to protect him and those who were sent to kill him.

A fierce robber has plotted a major heist. But unfortunately, his plan was unintentionally foiled by two dispirited middle-aged best friends, and the stolen cash disappears.