What I came to learn was the GM Hwang Kee, studied in China came back to Korea in 1945 and opened the Moo Duk Kwan dojang teaching "Hwa Soo Do" his art wasn't very popular and he closed his first dojang, so then he started training wiht GM Won Kuk Lee at the Chung Do Kwan Tang Soo do dojangs, then in 1947 GM Hwang Kee reopened his dojang teach Tang Soo Do Moo Duk Kwan, not to long after this GM Hwang Kee found the Muye Dobo Tongji, which really changed his whole out look on his Tang Soo Do Moo Duk Kwan, and he started the wheels in motion, and eventually created the Soo Bahk Do Moo Duk Kwan to replace the Tang Soo Do Moo Duk Kwan from what he had learn from th muye dob tongji manual, the Yuk Rho and Hwa Sun Hyungs actually come from this books whcih had a section on Kwon Bup (fist fight method) and the rest is really history at this point.
