Just when a middle-aged aspiring bus driver thinks she and her 7-year boyfriend are headed to the altar, she learns that he is involved with another woman. A year later, she receives invitation to their wedding banquet, where she accidentally foils the plan of that woman’s ex-boyfriend to reveal her as a cheater and a swindler. These two jilted lovers decide to join forces and come up with a plan to take revenge on the alleged con woman.
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.