Seems the WHRDA version makes it sound as though the Hwarang was formed specifically as a warrior class. Plus WHRDA makes it sound as though the military leaders of Hwarang all became monks and went into hiding to practice their art. This is not true. A lot of them went on to be prominent merchants and politicians. Some may have become monks as well, but I would not go so far as saying they all donned the robes and went into the mountains in secrecy. Nor do I believe they taught secretly handing it down from one person to the next.
Again, I have to emphasize that my disagreement of their history is not meant to say their martial art is bogus or their abilities lacking. I simply feel they are embellishing to make themselves more than they are.
Understood. And not necessarily disagreed. ;-)