In the same year he received the black belt in taekwondo from Grandmaster Hwang Kee.

[1] In 1968 he established his first school in Seoul "Tchon Young", which was one of the first teaching Taekwondo and Hapkido together.

Kim holds the 10th dan in Hapkido, 9th dan in Taekwondo by World Taekwondo Federation Holds the degree number 7 of the Korea Hapkido Federation and number 9 by the Korea Kido Association.

To solve this issue, the masters Ji, Han-jae; Kim, Yun-sik; Kim, Young-jin; Myung, Kwang-sik; Kim, Yong-whan; Lee, Tae-joon and others united to establish the first association to take care exclusively of Hapkido; it was named "Korea Hapkido Association", also known as "Dae Han Hapkido", and Grand Master Ji, Han-jae was elected the first chairman.

The practitioner of the Bum Moo style is instructed to finish the fight quickly, using any available material as weapon or any part of his body, aiming the opponent's pressure or vital points.