The Ring of Death
This story tells a story of an underdog mistreated by his family, given kung fu instruction from an unlikely source, and reddeemed when he comes back to take on foreign champions in a tournament staged before an imperial audience.
Starring Cliff Lok, Hwang Jang-Lee, Dean Shek, Sek Kin, Linda Lin Ying, Lee Hoi-Sang, Linda Lin, Yeong-mun Kwon
Watch "The Ring of Death" on Amazon released in 1980. It's a drama and action & adventure 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 only available for purchase or rent.