Echoes Beneath the Crown.

Far beyond the valleys, in a kingdom resting high upon the mountains where rain seemed endless, a child was born.
For years, the royal couple had tried in vain to conceive an heir. So when the boy finally came into the world, his arrival was awaited with reverence - and expectation. He was, after all, the rightful successor to the crown.
They named him Min Yoongi, heir of the Min dynasty.
His childhood, however, was anything but ordinary.
He had no friends. None dared to claim such a title. He was feared - too commanding, too dangerous, his mere presence enough to drive others away. Anyone who attempted to approach him quickly learned to keep their distance.
The only company he could tolerate was that of a young knight's daughter, Hwang Yeji, and her three companions - Jace, Lucas, and Rafael.