Horror: evil spirits in ancient Chinese houses, resentful spirits in graveyards, human skin puppets, life-changing formations, strange rules in books, and cyclic death curses
Sadomasochism: Two-way deep love, two-way suspicion, mutual harm, love in a cage, separation between life and death, obsession becomes a demon, love cannot be achieved, and the bones cannot be returned.
Traveling through the book: The plot collapses uncontrollably, the original book's heavenly backlash, the strange power outside the book, the protagonist escapes his fate but falls into a deeper prison
