When Chen Muba, the night shift worker at the funeral parlor, woke up, the people in the city knelt outside the door and begged him to calm down the evil spirits. No one knew that what resided in his body was not a fierce ghost, but an evil spirit that had been forgotten for hundreds of years. Forensic doctor Zhou Jiuyuan brings an ancestral copper bell to get closer to the truth, night watchman Wu Laizi renews the talisman with his life, and the memories of Lin Sanniang, a paper-zhapo, are piece by piece to piece together the truth about the blood sacrifice that year. When the seventh deceased appeared, Mute Chen finally heard the evil spirit whispering: 'You are not the host, you are the door. ' But the one who really wants to open hell is the old blind man he sees every morning, sitting in the dark alley.
