A long time ago, there were two hostile countries on the Western Continent, one was the North Country, which occupied the northern land, and the other was the Southern Country, which occupied the southern land.
The two newly appointed emperors presided over and signed a peace treaty. Just two months before the peace treaty was invalidated, a couple eloped.
They are respectively the only princess of the South Kingdom - the Princess of the South Kingdom, and the only prince of the North Kingdom - the Prince of the North Kingdom.
Purpose: Love and Peace