Been following this discussion, and enjoying the mostly well-informed posts presented on the lack of historicity in modern TKD. I must disagree with this statement, though - I think it hits close to the mark, but misses it slightly.
In ancient Silla, there really was a group called the Hwa Rang that practiced martial skill, studied Confucian classics,and observed notable ethics and service to King and Country, and many of them did become famous generals and political leaders. The northern kingdom of Gokuryeo really did defeat a 300,000 + man army of Sui warriors (mostly in a single battle, BTW), and hold off invasion after invasion, eventually precipitating the fall of the Sui Empire to the Tang after years of losses due to war. Silla then unified all the Korean penninsula with Tang help, but then really did battle the Tang right off the peninnsula and gain 300+ years of independence. The succeeding Koryeo empire really did withstand six separate Mongol invasions spanning some 30 years (a feat no other kingdom managed), before falling to the Horde (not through battle, but through internal rebellion and a back-door deal, BTW). The Choseon Koreans really did battle Japan to a standstill and eventually forced them off the penninsula during the Imjin Waerun, and one Korean Admiral really did use incredible engineering and tactical skill to achieve more lopsided victories against far superior numbers than any naval force before or after (rightly becoming a national hero).
You see, Korea really did have a great history that included many astounding martial high points, incredible tales of bravery and sacrifice, and filled with the types of things easily making martial legends. The problem is that, between the Confucian culture of the Yi and the Japanese Occupation, NONE of that glorious history is preserved in any of the current martial practices.