I don't like historical korea lol, esp if he's a king seme nah, the end would be like this possibly
He has so many enemies, he's only soft with his uke, uke empathize with seme's nature, angst, uke runaway but can't move on, angst again, seme got hurt by his enemies or something, they end up being together in love and "it's the world against our love, we could survive this"