The Spirit of Bruce Lee (1973)

A martial arts expert named Chang Chen-Wai runs a jade-importing business with his brother, Chang Fan. When Chang Fan suddenly disappears on a buying trip in Thailand, Chang Chen-Wai gets a little worried and decides to travel down there to find him. When he arrives there, he meets another kung fu expert named Li Pai-Yu after helping him fight off local thugs in a village. They become friends and Li decides to help Chang Chen-Wai find his missing brother. When they both learn that Chang Fan was murdered by the henchmen of a gangster named Ming Pan-Tin, Chang Chen-Wai resolves to revenge his death. They both go to fight off the henchmen one by one and find the head leader, Ming Pan-Tin.