Cheng Chao-an (Bruce Lee) is a Chinese man who moves to Thailand to live with his adopted family and work in an ice factory. He meets his cousin Hsu Chien (James Tien (actor)) and Hsu's younger brother by accident when Hsu Chien stands up to local street thugs. Cheng refrains from getting involved, as he swore to his mother to never participate in any fighting. He wears a jade amulet around his neck as a reminder of his pledge.