In Change of Gangster, his long-delayed fifth film as a director and actor, Francis Ng plays Francis Ng, a fading star whose recent failed attempt at an arthouse reinvention leaves him in dire need of a hit. He reluctantly accepts the lead role in The Godfather’s Son, a gangster drama bankrolled by a rich heir (Qiao Shan), whose director (Wen Song) is aiming for all-time greatness, and in which child star Feynman (Feynman Ng, Francis Ng’s actual son) is to play his son. But the has-been and the child actor don’t get along at all, and the beginning of production is plagued by constant strife, until by accident Francis’ head is hit by a falling toolbox. When he wakes up, he thinks he’s actually the gangster he plays in the film, and that Feynman is really his son. Sensing a way to salvage his film, the director decides to follow the brain-injured star around with cameras, as he prances around Hong Kong challenging gangs, while trying to connect with the boy he thinks is his son.

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