The movie is starred by Dida Diafat, A Thai boxing champion, and it's based on his autobiography, although his character is called Ryan. So he's playing himself, I suppose. Diafat's character gets thrown in jail in France, where he learns the basics of Thai boxing from another inmate.
Directed by: Xavier Durringer
Starring: Dida Diafat, Bernard Giraudeau, Florence Faivre