Cultivation? I Don't Understand, I Work as a Handyman

"Xu Wen, come with me quickly. The widow is dead. Her face is pale and her eyes are frightened. It seems that she was killed by something unclean." "I don't understand what unclean things there are. I'm just an ordinary detective. For such weird things, you should hurry up and go to the paranormal department." "Help, senior, please come to the rescue!" "Senior, where did you come from? I'm just a little catcher. I don't know what you are talking about." "Who is here? Come out! Let me have a taste, Uncle Ghost." "Damn it, it's you, the so-called ghost, who disturbs my sleep, right? Well, well, well, watch me fuck you to death." In a strange world, every night when night falls, ghosts are rampant and ghosts roam freely. Spiritual cultivators try their best to resist, but ghost cultivators interfere with it. In this strange and dangerous world, where should Xu Wen, a small policeman, go? Traditional cultivation system, Qi refining, foundation building, golden elixir, etc.