In an era of ghost Qi resurgence, severe psychiatric patient Li Shiwei firmly believes he is an interstellar secret agent saving the Earth. Facing evil spirits harming the people and the city-destroying conspiracy of the Heavenly Demon Cult, he steps forward with an extremely pure heart and fearless courage. Assisted by the fearless officers of the Exorcism Bureau, Li Shiwei relies on his formidable strength to subdue demons and vanquish devils all the way, healing his comrades, and shatters the evil array at a critical moment to save all the people of the city.