Follows troubled youth Chan Lok-kwun as he accidentally enters the Walled City, discovers the order amidst its chaos, and learns important life lessons along the way.

A family reunion dinner turns awkward when Bernard arrives with his new girlfriend, who happens to be big brother Steve's old flame. With Steve's casual partner comes to his rescue, anything that can go wrong goes laughably berserk.

Four young lives were changed forever when they become involved in the 1967 Hong Kong Leftist Riot; half a century later, another four face similar challenges amidst the Mainland-Hong Kong conflict.