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Ho Sau, an undercover agent, has been working with Yau, a drug lord, for years, but his job and family are in trouble.
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.
Kung and Kin's rivalry goes way back to the seventies when they fought over the same girl, who eventually became Kung's wife. Now they run competing phone stores right across from each other on Mongkok's busiest street, and stretch their minds trying to outdo each other with crazy promotions.