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Decades after the abduction of his newborn twin, world-famous American pianist John Ma (Jackie Chan) arrives in Hong Kong to perform and finds himself face-to-face with Boomer (Jackie Chan), the identical twin brother he has never known. When the reunited brothers switch places by mistake, John discovers that Boomer is a petty criminal with a knack for getting into trouble. Soon John gets in over his head with a group of gangsters looking for Boomer, and his brother vows to save him. Wikipedia