The incompetent young man Liu Xiaoman accidentally broke into the "Six Paths Spiritualism Bureau" and was appointed as a supernatural investigator by mistake. In the weird and bizarre supernatural cases, he gradually discovered the truth hidden under the appearance of "difference between humans and ghosts" with the help of various partners and cases involving life and death. As the three volumes progress, Liu Xiaoman goes from a fledgling to a man of his own. Together with his partner Xu Lingling, his pet male cat, etc., He travels between the Yin and Yang realms. Through a series of hilarious but dangerous cases, he gradually uncovers the thousand-year grievances between the six realms, as well as the hope for the reconciliation of the worlds of "humans, ghosts, and spirits". In the end, after the war ended, everything returned to peace, and Liu Xiaoman also found his own place.
