The line of Ji Do Kwan begins with GM Chun Sang Sup and Yoon Byung In. GM Chun Sang Sup, has been trained at Sensei Gichin Funakoshi of Shotokan Karate and in his early youth at Lee Kyung Sul for Judo. His brother, GM Yoon Byung In, has trained at Toyama Cancer Shudokan Karate and an unknown Chuan-Fa (Kung-Fu) Master.
GM Chun Sang Sup and GM Yoon Byung In collaborated intensively to make it one of the real brothers, on March 3, 1946, Chun Sang Sup set up his own school Chosun Yun Moo Kwan, which became Ji Do Kwan later in 1953 . In probably the same year, but at the end of 1946, GM Yoon Byung In, his school was set up YMCA, which will later be Chang Moo Kwan. These two currents Jido Kwan and Chang Moo Kwan still exist.
The two Grandmothers disappeared during the Korean War and GM Chun Sang Sup has never been heard again, GM Yoon Byung In was found in North Korea and died in 1983.
In 1953, DR. Yoon Kwei Byung the highest graduate of that moment renamed Chosun Yun Moo Kwan to Ji Do Kwan "The Way of Wisdom"