Po Sui Xu Kong is a role-playing game. In the late Song Dynasty, Mongolia invaded the Central Plains and the court was unable to resist. So the people of rivers and lakes organized by Longzunyi began to fight back against the Mongolians. Recently, Han Gong, a famous Wulin resident, invited Li Ling to carry out a mission. Li Ling retired for many years and did not want to set foot in Wulin any more, so he decided to take part in it through his nephew, Chuan Ying. Chuan Ying had just finished flying swallow and thunder knife practice in front of the roof of the mountain that day. His uncle expressed the idea of letting him go down to the rivers and lakes and said that he would experience many adventures and succeed in some famous undertakings.