This Magician Actually Wants to Accept Me as His Disciple

At the gate of the university, an old man wearing a monk's robe stopped me. "Young man, your hall is dark, and there will be a bloody disaster in the near future." I thought I met a liar, but turned out to be his apprentice. The old man taught me how to draw talismans, recite incantations, and read Feng Shui to ward off evil spirits, but I gradually discovered that the supernatural events he took me to deal with were all fake. He said the aging water pipes were caused by ghosts, and the excessive formaldehyde was caused by ghosts. Until one day, we met the real one. The old man put away his playful smile and showed a serious expression for the first time. "This time, it's true." That night, he conquered the evil spirit with his life. Before he died, he put a worn Taoist secret book into my hand. "Boy, from now on... It's up to you." From then on, my life completely changed. A college student who doesn't believe in ghosts and gods, a female ghost who came back from the dead, and a Taoist secret book that she can't understand. This world seems to be quite interesting.