Zhao Yi and Li Rui—elite business school graduates in modern China—accidentally time-travel to the Great Xia Dynasty, where they become undocumented refugees. Both unlock cutting-edge modern systems! Starting with selling琉璃 keychains, then launching a sizzling iron-grill barbecue stall, they leverage their memory of modern business models, machinery, and consumer goods to conquer the bustling urban marketplace—step by step, empire by empire.