This movie is 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.This movie is 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.This movie is 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.