The Dragon's Infernal Showdown
龍拳蛇手 (original)
Lee Lung witnessed the murder of his parents by the ruthless bandit Shek King who in turn abducted Lee's infant sister. Lee wanders the land and learns martial arts from a drunken master. Once his skills are perfected, Lee sets out in search of his long lost sister and the villain Shek King.
Starring Dragon Lee, Kitty Meng Chui, Lee Ye-Min, Martin Choe Min-Kyu, Min Bok-gi, Ma Do-Sik, Brian Baek Hwang-Gi
Watch "The Dragon's Infernal Showdown" on Tubi TV released in 1980. It's a action & adventure and drama movie, and has a rating of 6.7 out of 10 from Imdb which is usually fine for this kind of movie, and is currently available to watch for free.