Lee was a student at the Chosun Yun Moo Kwan Kwon Bop Bu (Yun Moo Kwan), learning from its founder, Sang Sup Chun. Later, after the Korean War Armistice Agreement was signed in 1953, Lee started teaching the returning Yun Moo Kwan Kwon Bop Bu members at the Hankuk Chaeyuk Kwan Dojang. He had conflicts with Chong Woo Lee and left to start his own annex Kwan by setting up a tent at a High School. Later, Chong Woo Lee changed the Yun Moo Kwan Kwon Bop Bu's name to Jidokwan. Kyo Yoon Lee states that Han Moo Kwan is from Choson Yun Moo Kwan Kwon Bop Bu, not Jidokwan. From an interview with Lee: