Let Me Deal with the Mystery? but I Haven't Graduated Yet!

Why do babies always cry in the middle of the night in old residential buildings? Why do bloody footprints frequently appear in girls' dormitories? Why does the villa often make the sound of high-heeled shoes? This is not about science, but my daily experience of dealing with them. Welcome to Yiling Club, I am Zhang Rong, the store manager here, you can call me Mr. Zhang, or you can call me the Spiritual Exterminator...