神偷妙探手多多 (1979)

Biggie (Roy Chiao) and Tiny (Richard Ng) grow up together. They fight all the time. Biggie is a detective and Tiny is a thief. Biggie has the satisfaction of catching Tiny and putting him behind bars. When Tiny is released, he is approached by Daigau who wants Tiny's help to steal the world famous diamond.