Sing (Stephen Chow) is a mainland China country boy who arrives in Hong Kong to visit his Uncle "Blackie Tat" (Ng Man-tat). When Sing stays with his uncle and his friends in their apartment, Blackie soon learns of Sing's supernatural ability to see through objects and, later on, his ability to change playing cards by rubbing them. He takes advantage of this and turns Sing into the Dou Seng or the "Saint of Gamblers".