Since the founding of the Yuan Dynasty, Emperor Zhao Yu Wen of Yuan Yuan managed martial arts, quelled rebellions inside, and eradicated barbarians outside. The Huntian Supervisory Institute Si Zheng Bai and Yi Tong accompanied Sun Du Hu of the Duhufu of Xiyuan, and went to Xiyuan to investigate the locust plague and cholera that plagued the people. Bai Yi Tong observes the heavens, predicts the incision, establishes a calendar to solve problems, and solves strange cases every time, earning the emperor's trust. But Bai Yi Tong was strict and inflexible, but the others could not say anything and just listen. Bai Yi Tong is idle except for his work, and his teacher, Sikong Chong, freely devotes himself to research at the inspectorate. Bai Yi Tong and Sun Du Hu found a hole in a cave during the locust damage investigation, where they are indiscriminately attacked by locusts. Then, Bai Yi Tong returned to the city with his hands and reported this strange incident to His Majesty the Emperor…