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Look up Fighter in the Wind. It's about the founder of Kyokushin Karate Mas Oyama.
"Strength without justice is violence. Justice without strength is impotence." -Mas Oyama
Come ye trials and challenges; come life's big waves, for I am ready! -Mas Oyama
Mas Oyama specifically recorded Korean Kwonbub being passed down. Taekwondo is the army version; Yetbub (Kyuksul) is the civilian original.
MAS OYAMA COIN