Ah, missed that. I apologize for my misunderstanding and the resulting misguided jabs at you.
I probably should have been clearer and less snarky about it.
I mean if anything it's pretty remarkable that the Koreans remained loyal to the dynasty over the occupation. I don't see many other societies that would put up with that for decades.
Other courts tried fleeing to islands too, by the by, after their country was overrun. The Kwarazmians, and Bela of Hungary of course. Didn't end well for the former, and the Mongols left withing a year in the latter case.