Accomplishments
Choi Yong-Sool's first student and the first person known to have opened up a dojang as a chief instructor under grandmaster Choi.
After watching Choi Yong-Sool successfully defend himself against a group of men when an argument erupted in the yard of the Seo Brewery Company, Seo, who was the chairman of the company, invited Choi to begin teaching martial arts to Seo and some of the workers at the distillery where Seo had prepared a makeshift dojang.
In 1951, Seo ever opened up the first proper dojang, which called the "Daehan Hapki YuKwonSool Dojang (Hangul: 대한 합기 유권술 도장)".
Seo designed the first symbol used to denote the art consisting of two inverted arrowheads featured in both the original and modern incarnation of the Korea KiDo Association, the World Kido Association.
Choi Yong-Sool was also employed during this time as a bodyguard to Seo's father who was a congressman.
Seo claims that he and Choi agreed to shorten the name of the art from 'hapki yu kwon sool' to 'hapkido' in 1959.
Read more about this topic: Seo Bok-seob