Cobra (1977)

A fellow member in a martial arts school murders Indra's teacher and Yanti's father. But Indra and Yanti are told not to take revenge as their skills are still inferior. Indra and Yanti then move to the city. Here, Indra accidentally becomes a member of a syndicate and he earns a good living from it but his heart is not at peace. He intends to quit but then Yanti and her child are murdered by a member of the cobra syndicate. So he destroys the syndicate's headquarters and faces the man who killed his teacher, the syndicate's leader. Even though his skill is inferior, he manages to win in the end.