A Certain Magic World's Ordinary Demon King

#ModernFantasy, #DimensionalTravel, #CivilServantxDemonKing, #TenderTop, #YoungerTop, #PoliteTop, #ClumsyBottom, #DemonKingBottom A Demon King who traveled dimensions to 21st-century Korea to conquer the world. Unfortunately, this world was not so easy, and the Demon King was defeated by a Hero. But just what exactly went wrong? The Demon King, who should have returned to his original world after being defeated, somehow couldn't go back and was discovered in a dungeon. Out of humanitarian concerns, the government granted him permission to stay in Korea until he could return. Subsequently, after changing his name to Kim Sion (Male/Age???), he found employment as a researcher at the Korea M...