Boko

A young man finds himself in a really bad situation. A bully thinks that the young man caused the bully trouble. The young man is in grave physical danger.
The only way out of the situation is for the young man to get the protection of the one kid that the bully is afraid of. The one kid that the bully is afraid of, is the son of a Kung Fu teacher.
The young man gets the protection, at the cost of a lot of hard physical and mental work, learning Kung Fu.
The solution to the young man's problem inevitably involves a physical confrontation with the bully. The physical confrontation requires courage and the knowledge of self defense that the young man has learned over several years. The risks are great, but there's no other way out.