During the Korean War, Chun Sang Sup was kidnapped to North Korea and vanished, and was presumed dead. Joseon-yun-moo-kwan--kwon-bup-bu teaching passed to the hands of Yoon, Kwe Byung who renamed the school, ji-do-kwan, "wisdom way school."
Yoon was against unifying the various Korean schools of martial arts under the banner of Taekwondo. Like Kee, Hwang, the founder of Tang-soo-do Moo-duk-kwan, he wanted ji do kwan to remain free from organizational control. This did not sit well with the other members of Ji-do-kwan and Lee, Chong Woo was elected the new president of Ji-do-kwan.
Lee forged the ji do kwan into one of the leading schools of martial arts in modern Korea. Ji do kwan differed from other schools mainly on kyorugi (sparring). Its students were noted for their consecutive wins at South Korean sparring competitions. WhenTaekwondo tournaments first became active in the 1960's and 1970's, the ji do kwan distinguished itself. In addition, Lee has held several pivotal positions with the Korea Taekwondo Association and the World Taekwondo Federation throughout the years.
Ji do kwan pays tribute to its Shotokan (Song-do-kwan in Korean) and Judo influence in its emblem, which depicts two circles. If the upper circle is removed, the central circle of the Shotokan emblem is revealed. The outer ring depicts the pattern of the Kodokan Judo emblem.
The first ten black belts of ji do kwan were: Bae, Young Ki; Lee, Chong Woo; Kim, Bok Nam; Park, Hyun Jung; Lee, Soo Jin; Jung, Jin Young; Lee, Kyo Yoon; Lee, Byung Ro; Hong, Chang Jin; and Park, Young Kuen.