Ji Do Kwan
At the end of World War II, Lee Kyung Suk asked Chun Sang Sup to set up a course of kwon bop at his school. This program was named Chosun Yun Moo Kwan Kwon Bup Bu.
Chun Sang Sup began his martial arts training in judo while in high school. He then moved to Japan to attend Dong Yang Chuck Sik College. It was during this period that he was exposed to Shotokan karate, and he is believed to have earned a black belt. Upon returning to Korea, Chun is believed to have secretly taught Shotokan karate to private students, beginning in approximately 1940. Because privately teaching karate was outlawed by the Japanese occupying forces, his teaching was not formally recorded until he established his training method after World War II. Chun Sang Sup enlisted the help of Yoon Byung In to teach karate at the Chosun Yun Moo Kwan. Yoon was a fourth-degree black belt in Shotokan karate.
Yoon Byung In taught at the Chosun Yun Moo Kwan for becoming independant and forming his own school, known as the Chang Moo Kwan. Chun Sang Sup again returned to full-time teaching responsibilities. Chun’s instruction continued until an evil twist of fait found him kidnapped and imprisoned by the North Korean military during the Korean War. He was never heard from again and is believed to be dead. Upon the loss of Chun, Chosun Yun Moo Kwan Kwon Bup Bu teaching passed to the hands of Yoon Kwe Byung, one of Chun's senior students. He renamed the school Ji Do Kwan, "Wisdom Way School."
During the 1950s, when the various Kwans of the Korean martial arts began attempting to merge under one banner, Yoon Kwe Byung was against unification. Yoon wanted the Ji Do Kwan to remain free from organizational control, but the other senior members of the Ji Do Kwan disagreed. As a result, Yoon was ousted from his presidency, and Lee Chong Woo was elected the new president of the Ji Do Kwan. Lee Chong Woo forged the Ji Do Kwan into one of the leading schools of martial arts in modern Korea. Its practitioners were noted for their consecutive wins at South Korean tournaments. Lee also went on to hold several pivotal positions within the 'Korea Tae Kwon Do Association and the World Tae Kwon Do Federation.