THE SMART TRICK OF KOREA THAT NO ONE IS DISCUSSING

Goryeo was invaded from the Mongols in seven key strategies within the 1230s till the 1270s, but was in no way conquered.[117] Exhausted soon after many years of battling, Goryeo despatched its crown prince to the Yuan capital to swear allegiance towards the Mongols; Kublai Khan acknowledged, and married one among his daughters on the Korean crown