Fighter in the Wind or Baramui Fighter is a 2004 Korean martial arts film based on the Japanese book Karate Baka Ichidai which is an account of the life and exploits of Kyokushin founder, Masutatsu (Mas) Oyama who was born Choi Yeong-eui.
The film focuses on his migration to Japan and how he first came to know about karate.
I found some scenes and story line greatly exaggerated, being a Kyokushin student myself. However, if you are not into historical accuracy and more into entertainment then this will definitely whet your appetite.