The World's Last Magician

This is a world with nine realms, and one of them, "the magical world was destroyed by an unknown force, and there was a young man in it who did not die. Instead, with the help of the two elders of the magical world, he went to the human world. The young man in the human world had no one to protect him, and the young man still had all the properties of the magical world in his body. What kind of story would there be in the human world.