I recommend the book "Ghost and God Selling Flowers". The main character is a detective who learns about Feng Shui and other mysterious cultures while investigating a case. He also discovers some wonderful worlds. The plot of the novel included tomb exploration, mystery and suspense, as well as the appearance of various ghosts. At the beginning of the story, the protagonist also met the old Taoist priest and accepted his guidance, but the Taoist priest was not killed by the ghost. I hope you like this fairy's recommendation. Muah ~π