A young cop Chow Man Chun was sent to triad society as an informer for 3 years because of a mistake in an action, led his colleague died that made his commander and triad society angry. At last, he was caught by the triad society. Fortunately, he got help from an old friend Fong Kwok On and quitted the risk. He joined the organization of triad society of Uncle Wing.

Chow Man Chun wanted to investigate the case and want to help Fong Kwok On to quit the triad society at the same time. In meanwhile, Chow Man Chun fell in love with Helen, but he discovered Helen was a lover of Uncle Wing. He abandoned Helen at last.

Ah Fu was a member in Uncle Wing’s organization .He wanted to become a leader .He cooperated with inspector Shek to kill Uncle Wing and got Helen on hand. He also made Fong Kwok On quitting the organization and made Chow Man Chun in trouble in a murder and drug’s crime.

Fong Kwok On and his wife wanted to save Chow Man Chun but killed by Fu’s killer .At the end, Chow Man Chun got help from a senior cop Uncle Ming to attack Fu…