In the third year of paranormal recovery, the school gave us a "Handbook for Self-Rescue when Encountering Ghosts".
Rule 1: Don't trust anything that moves, including your shadow.
Article 2: If you see an old man wearing a shroud asking for directions, you must pretend not to see him, otherwise he will follow you home.
Article 3: After the pen fairy game is over, you must break the pen, otherwise there will be an extra person in your bed tonight.
I followed the rules strictly until I saw an old man wearing a shroud standing behind me in the dormitory mirror.
And what he was holding was the pen that I forgot to break when I was playing Pen Fairy yesterday.