Lu Chen, a modern-day warehouse keeper, faints while working overtime. When he opens his eyes, he has become the lord of Qingya City, a city abandoned by the Great Liang court because it is too poor. At the start, he has only 517 elderly, weak, sick, and disabled people, an empty granary so bare that even the mice are crying, and an army of 3,000 Northern Di soldiers arriving within half a day. Everyone thinks they are doomed, but Lu Chen simply smiles. That's because he has activated the Myriad People Marketplace System: the more people he has, the more money he earns! He distributes rice to attract new residents, builds curved-beam plows, and even makes black gunpowder by hand. When the Northern Di army returns to lay siege to the city, they are completely dumbfounded!