Lu Xin accidentally obtains a black door that allows him to travel to a post-war cyberpunk world. He doesn't have any lofty ideals; he just wants to quietly collect scrap. Scrap copper, scrap iron, scrap gold, scrap robots, scrap industrial machine tools—these are all his targets. This is the story of an ordinary person who, after gaining the ability to travel through time, gets rich by moving things.