Sai Wan dik goo si Soundtrack (1990) OST

The story takes place in the 1960s, where three street hooligans, Peng, Qiang, and Wei, got to know each other due to a misunderstanding and became sworn brothers with different surnames. Later, Peng joined the police force, and Qiang and Wei, in order to help their friends achieve success, voluntarily surrendered to help Peng make contributions and were sentenced to prison. But the ambitious Peng aspires to achieve his own promotion and wealth, making more use of his friends and monopolizing Qiang's girlfriend, and even killing Qiang in one action. Only then did Wei realize that Peng was treacherous and determined to seek revenge for Qiang. On the occasion of Peng receiving a special medal from the police, he shot and killed Peng. When Wei defended himself in court, he criticized for killing his friend, and then accepted legal sanctions peacefully.