Xu Ning, ruined by his former friends, discovers a bronze door in his ancestral home that leads to another world. He starts a lucrative business as a cross-world trader, exchanging modern goods for rare items. From exchanging bottles for ginseng and mirrors for Cordyceps, he amasses wealth in the modern world and uses advanced weaponry to conquer the other world. He surpasses those with martial arts skills using machine guns, mortars, and Gatling guns. He becomes the ultimate ruler of this new world, subjugating emperors and martial arts masters.