Since the founding of the Changyuan Dynasty, Emperor Zhao Yu of Changyuan has been prospering with both civil and military power, suppressing rebellions at home and eradicating barbarians abroad. The Changyuan Dynasty has been prosperous. Bai Yitong, the Chief Justice of the Hun Tian Supervisory Office, accompanied Sun Duhu of the Xiyuan Protectorate to Xiyuan to investigate the locust plague and cholera of the people. The Hun Tian Supervisory Office is responsible for observing astronomical phenomena, calculating solar terms, and formulating calendars. It can often find unusual clues from strange phenomena, so it has solved many strange cases and is deeply trusted by Emperor Zhao Yu. The chief justices of all generations are old-fashioned and serious. Wherever they go, people are silent and obey their orders. Bai Yitong, as the chief justice of this generation, seems to be a little sloppy. Apart from tossing his Si Pan and stargazing mirror, he seems to be idle all day. His master, Sikong Chong, is a free-spirited man who does not care about worldly affairs and is absorbed in his studies in the Supervisory Council. While investigating a locust plague, Bai Yitong and Sun Duhu found a mine cave where countless locusts appeared and attacked the people in the cave. Bai Yitong saw something strange and returned to the capital with Sun Duhu to report...