Li Bun Ku 1: In New Era (1970)

Li Bun Ku, a homeless child whose origins are unknown, lives with his adoptive father who loves him very much. Since the arrival of Muk Sen (his adoptive father's nephew) he feels increasingly depressed because he is not liked by his adoptive father's family, he finally leaves the house. In his escape Li Bun Ku managed to save the life of a gang leader, and he was invited to join a gangster. One day because he missed him he returned to his adoptive father's house, but apparently he had died. In his adventure to become a member of the gang, he realized that his adoptive father's death was related to the actions of a gangster member.