Song Cheng, a modern man, unexpectedly travels back in time to the chaotic Great Qian era on the verge of collapse, becoming a prison guard responsible for watching over female prisoners. With enemy troops about to breach the city walls, he leads more than a hundred female prisoners to the mountains, intending to carve out a kingdom of their own. Unexpectedly, he discovers that the mountain is actually the territory of the Song Prince of Great Qian. Seizing the opportunity, he impersonates the Song Prince and develops Jing Mountain, eventually establishing his own empire amid the chaos of war.