Chard Pa Yong (1979)

Plew, a professional killer, comes back to Thailand to find out who killed his father. He is forced by Bunpot to kill Slavut, but instead he accidentally helps Slavut get away. While on the run from Bunpot, he meets Jack; they decide to get out of the country. Later they come back to help one of his best friends and kill Bunpot and all of his men.