1946: Ji Do Kwan. Founded by Chun Sang Sup, on May 3, 1946, as the Choson Yun Moo Kwan Kong Soo Do Bu.

When Chun was a teenager he learned Judo and karate while studying abroad in Japan. After WWII, he opened the Choson Yun Moo Kwan Kong Soo Do Bu at the former Judo school, Choson Yun Moo Kwan, in Seoul where he taught Judo and karate and he began to recruit new members. He had a slender figure and looked ordinary, but was an intellect and always wore suits.

The Choson Yun Moo Kwan  in Seoul, but the major development and structural growth was spread from Chun Ju, Cholla Buk Do as a center. Chun  opened another school in Kunsan, Cholla Buk Do in May 1947, and spread his school's reputation from Jun Joo to Kunsan, I Ri, Nam Won, Jung Uep and further. However, during the Korean War Chun was kidnapped to North Korea, the Choson Yun Moo Kwan Kong Soo Do Bu was abolished, and it was renamed Ji Do Kwan (Wisdom Way School).

The Ji Do Kwan was opened and ran by Yoon Kwe Byung and Lee Chong Woo until 1967. However, during the process of unification with the Korea Taesoodo Association, Yoon and Lee had conflicts. With Lee Chong Woo (Ji Do Kwan) as the leader, Lee Nam Suk (Chang Moo Kwan), Uhm Woon Kyu (Chung Do Kwan), Hyun Jong Myun (Chung Do Kwan/Oh Do Kwan), and others planned to unify, but Yoon Kwe Byung and Hwang Kee (Moo Duk Kwan) declined.

Some Ji Do Kwan graduates were Bae Young Ki, Lee Chong Woo, Kim Bok Nam, Park Hyun Jung, Lee Soo Jin, (ung Jin Young, Lee Kyo Yoon, Lee Byung Ro, Hong Chang Jin, and Park Young Kuen.

When Taekwondo tournaments became active from the beginning of the 1960's to the 1970's, the Ji Do Kwan distinguished itself due to its kyorugi (sparring). Some major representatives were Lee Seung Wan, Cho Jum Sun, Hwang Dae Jin, and Choi Young Ryul.

Ji Do Kwan's representing annex was the Han Moo Kwan, but Lee Kyo Yoon said the Han Moo Kwan root is not Ji Do Kwan, but rather the Choson Yun Moo Kwan. This shows the debate of the origins of the school.

Ji Do Kwan's first Kwan Jang was Chun Sang Sup, the second was Yoon Kwe Byung, and the third was Lee Chong Woo.

1946: Chang-Moo-Kwan. Yoon Byung In, who taught Moo Do with Chun Sang Sup in the Choson Yun Moo Kwan, founded the Chang Moo Kwan (development of martial arts training hall) in 1946 at the YMCA in Jong Ro, Seoul. The Chang Moo Kwan was represented with a symbol of two dragons.

Yoon spent his childhood in Manchuria and learned Jooanpa, a Chinese martial art (more commonly known as, Chuan-fa). In the 1940's just before Independence Day, he went to Japan to study abroad. While there, Yoon claims he studied karate under the direction of Kanken Toyama, founder of Shudokan karate, earned a 5th Dan, and was team captain at Nihon University.

After Korea's independence, he returned to Korea became the physical education instructor at Kyung Sung Agricultural School and started teaching Moo-do with Chun Sang Sup in the Choson Yun Moo Kwan on September 1, 1946. Later in 1946, he opened the YMCA Kwon Bup Bu in nearby Jong Ro, Seoul, teaching what he called Kwon-bop (fist method).

Yoon had a good relationship with Choson Yun Moo Kwan's Chun Sang Sup and once Chun and Yoon were called brothers because they trained so much together. Chun Sang Sup's younger brother Chun Il Sup said: "YMCA Kwon Bup Bu's Yoon Byung In and Lee Nam Suk trained with the Choson Yun Moo Kwan in the beginning, so I can say the Yun Moo Kwan and the YMCA Kwon Bup Bu were brother Kwans."

Yoon Byung In was basically a traditional Moo Do man. His body was small, his behavior was blunt, and he did not know how to wear his clothes and shoes fashionably. He wore a pair of oversized US Army boots. His left little finger had been cut off so he wore pair of special white gloves, even in the summer.

He taught his martial art (Ju An Pa Kwon Bup) to his students according to their body sizes, so the students could learn martial arts that suited their body specialty. Before the Korean War, on June 24, 1949, the YMCA Kwon Bup Bu held a Yun Moo Demonstration. Park Chul Hee demonstrated the "Jak Do Kwon", Park Ki Tae demonstrated "Bong Kwon" and Chung Do Kwan's Son Duk Sung, Uhm Woon Kyu and Lee Yong Woo demonstrated "Chan Jo."

YMCA Kwon-bup-bu practice sessions started at 4:30 PM. In the beginning more than 500 members were recruited, but after three months, only 180 members were remaining because of the severity of the training.  Yoon may have had some training in Chinese Quan-fa ("fist method"), which he taught under its Korean name of kwon-bop, but it is more likely that he taught the Japanese style of Shudokan karate. The reason for this possible deception is that many of the members of the Korean YMCA had been members of the independence movement during the occupation, and certainly they would have insisted that no foreign art be taught at the gym. On Mar. 5, 1947, a second club was opened at in the Ministry of Communications office, and taught by Nam-Suk Lee.

When Yoon was listed as missing during the Korean War and later declared legally dead, Lee gained control of the kwan. Yoon's surviving instructors built a central dojang in Seoul on Oct. 5, 1953, with Lee, Nam Suk elected as its second president and, from 1961 forward, he held several pivotal positions in the Korea Taekwondo Association, including vice president.Lee passed away in Southern California in late 2000.

The early Chang-moo-kwan black belts were: Lee, Nam Suk; Kim, Sun Gu; Hong, Jung Pyo; Park, Chul Hee; Park, Ki Tae; Kim, Ju Gap; Song, Suk Joo; Lee, Joo Ho; and Kim, Soon Bae.

The second Kwan Jang was Lee Nam Suk. The third Kwan, Jang Kim Soon Bae, had conflicts with Hong Jung Pyo and Park Chul Hee, which led to Hong and Park leaving the Chang Moo Kwan and opening their own school, the Kang Duk Won, in nearby Shinsuldong, Seoul, in 1956.