Yang Yun-ho has directed the 2004 South Korean film based on which Japanese book?
Yang Yun-ho:  Among the films Yang has directed since are "Libera Me" (2000), "Fighter in the Wind" (2004, for which he received a Best Adapted Screenplay nomination at the 2005 Grand Bell Awards), "Holiday" (2006), "Rainbow Eyes" (2007), and "Grand Prix" (2010). Fighter in the Wind: Fighter in the Wind (Korean: 바람의 파이터 ) is a 2004 South Korean film. Fighter in the Wind:  It is based on the Japanese book "Karate Baka Ichidai" which is a fictionalized account of karate competitor Choi Yeung-Eui (최영의, 崔永宜) who went to Japan after World War II to become a fighter pilot but found a very different path instead.
Karate Baka Ichidai