Build the Demon King's Castle

As soon as Luo Yi traveled to another world, he discovered that he had been kidnapped, owed money, and his left hand was possessed by a demon. So in order to survive, he took his creditors and used the hands of demons to build a large demon city containing various monsters near the village where he was kidnapped. Here it is. He is responsible for playing the titular Lord of the Demon King's Castle. Outside, he sells various equipment and props to adventurers. He is a famous master of weapon enchantment. Gem buyer. Task assignor. Star Adventure King. Big consortium. Big landowner. Big capitalist. Unknowingly, Luo Yi took control of the entire world.