The fictional Great Xia Dynasty has a territory similar to that of the late Northern Song Dynasty. There is a powerful enemy from the outside, Beidi, who is eyeing it. Internally, powerful officials are in power. The government is corrupt and the people's livelihood is in decline. The technical level is at the peak of the cold weapon era, but the application of gunpowder is still in its infancy. According to historical records, there was a legend called "Gun City" in ancient times. It possessed super-era craftsmanship and knowledge, but it has long been forgotten and is regarded as a myth by the world.
