Spoiler for Master Oyama, Episode 11, time 13.04:
This name refers to the most famous Korean Karate grandmaster who founded Kyokushinkai school. Famous for his enormous strength feat like killing a bull within one punch, he also traveled whole Japan to defeat Japanese grandmasters to prove his system. He also went overseas to challenge other fighting styles to prove his Karate is superior. His teaching is well noted for emphasis on realism and non padded sparring where attacks to head were permitted. One of the famous test in Kyokushinkai is 100 man test where students were expected to defeat 100 opponents consecutively to advance to higher level.
He is a controversial figure, calling all other Karate school as dancing instead of real martial arts.
Link:
http://www.masutatsuoyama.com/