Xiao Chenyu, a college student in the Department of History, accidentally traveled to the late Yuan Dynasty and early Ming Dynasty while observing astronomical phenomena. Liu Bowen, who lived in seclusion in Qingtian, regarded him as an "extraterrestrial visitor" who foreshadowed the future. Faced with this historical figure who was so wise that he was almost a demon, Xiao Chenyu could only rely on his little knowledge of history to pretend to be a ghost and act step by step. He originally wanted to fish in the water, but was pushed to the center of the wave of the times by Liu Bowen, and confronted with Zhu Yuanzhang, Chen Youliang and other powerful figures. A fake half-immortal and a true fortune teller. Where will the two of them join forces to lead this era?