The true history and origins of TSD have been best to death, as one person said it all depends on who you believe. GM Won Kuk Lee learned (Okinawan Karate) Shotokan while living in Japan, he brought Shotokan back with him to Korea in 1944 but he called his style Tang Soo Do, then in 1945 he founded the Chung Do Kwan, at that point he arts was known as Chung Do Kwan Tang Soo Do. GM Hwang Keen went to China where he learn Tai chi chaun and train in Sholin Long Fist, returning to Korea he opened a dojang calling his atr Hwa Soo Do Moo Duk Kwan, which failed and he close it. During this time it is reported that he train with MG Won Kuk Lee in Tang Soo Do and in 1947 reopened his dojang calling style Tang Soo Do Moo Duk Kwan. I believe it was in the 50's mabe the 60's he started the slow change to become Soo Bahk Do Moo Duk Kwan after he found the Muye Dobo Tonji which really influenced him a lot. This is what I have come to learn, again there are so many different stories I wonder whether it really matters any more. Ken