Karate Bearfighter

Based on the true-life story of a Korean fighter named Choi Bae Dal (who later changed his name to Masutatsu Oyama), the founder of Kyokushin Karate in Japan.
Young karate prodigy Oyama denounces martial arts after killing a gang leader in a bar fight and goes to work on a farm. But later, when an assassin is hired to stop Oyama from re-entering the world of martial arts, Oyama must take revenge.