Shuang xing ying zhao shou
The girlfriend of a con-man is being held in a brothel and he must try to raise 200 tales of gold as a dowry. So he cheats a country simpleton out of his money then goes and loses it in the casino resulting in the country man feeling sorry for him. The two become friends and as they are both expert fighters start working as instructors for a local big boss but this causes real trouble.
Starring Raymond Lui, Chiang-Lung Wen, Chi Kuan-Chun, Chen Chiu, Hsiu-chen Chen, Shao Hua Chu, Chau Tsai Chung, Hsing Nan Ho, Han Chang Hu, Fei Lung Huang
Watch "Shuang xing ying zhao shou" from streaming services Tubi TV, Amazon released in 1978. It's a action & adventure and drama movie, and has a rating of 5.8 out of 10 from Imdb which is fairly okay for this kind of movie.