Fang Yuan traveled to the Tang Dynasty and became the magistrate of Wuling County. After five years of governance, Wuling County built cement roads, hotels, clubs, factories, tea houses, etc., with an advanced economy and developed agriculture. In the second year of Zhenguan, there was a severe drought. The locust plague was raging, and rumors spread among the people that the emperor was immoral. Hundreds of officials forced Li Shimin to issue an imperial edict to punish himself. When Li Shimin was helpless, he fell into a dream during the day, dreaming that there was a wise minister in the south who could relieve his predicament, so he went south incognito for a private visit, and finally Finally, Wuling County.