Family dragon slaughtering

This is a story between closed villages in the early 1990s. There are disputes over five banners, traditional martial arts, and strange legends. The protagonist is disabled and strong. He occasionally has to be rescued by a hidden doctor to recover his legs and feet, but he also has to stay in the hidden doctor's office for three years to learn art. Unexpectedly, when he returned, he found that his sister was abducted by traffickers and looked for her thousands of miles... An alternative vision.