Xu Yuan travels through time to the Tang Dynasty and becomes a county magistrate on the empire's remote frontier. With no prestigious family background to rely on, he uses his practical abilities to transform a barren land in just five years. He builds roads and schools, promotes trade, improves livelihoods, and brings peace and prosperity to the people. A memorial in which he openly confesses his own mistakes unexpectedly attracts the emperor's favor. From governing a single county, Xu Yuan rises to the imperial court, using his talents to protect the people under his care and write his own legendary story in the Tang Dynasty.