Overhead China mainland. The orthodox dynasty of the Central Plains, Dayuan, valued culture over military affairs and had redundant officials and soldiers for hundreds of years, resulting in a weak national power. The 'Canglang Empire' (Rong tribe) that emerged from the northern grasslands moved south in a large scale, even breaking through the Central Plains defense line. The capital of the Yuan Dynasty fell, and most of the civil and military officials surrendered or were captured. The protagonist takes over a desperate mess that is financially bankrupt, with only tens of thousands of makeshift soldiers left, and everyone in the government and the public advocates fleeing to the safety of "Tiannan Jiangbiao" in the south of the Yangtze River. At this time, the 100,000 elite cavalrymen of the Canglang Empire were chasing after them.
