NOT KNOWN DETAILS ABOUT KOREA

Goryeo was invaded via the Mongols in seven significant campaigns through the 1230s right until the 1270s, but was never conquered.[117] Exhausted following a long time of combating, Goryeo despatched its crown prince on the Yuan funds to swear allegiance to your Mongols; Kublai Khan recognized, and married one of his daughters to the Korean crown