Hong Kong 1973. Tan Cheng is a good-heart but too rebellious youngster whose brother is an honest policeman very worried about him. Tan has no tolerance toward the authorities and he's no listening for his brother's recommendations, so gets involved with a gang of drug-smugglers that uses him for their traffics. When Tan understand he has been deceived, he turns against the gangsters, and a long fight and motorcycle chase ensues. The toughest enemy is Chou Chiang, a boss in the gang, but Tan kills everyone and dies heroically.