The background is the modern city "Linzhou". On the surface, it is an ordinary second-tier city, with normal life order and workplace rules (such as the male protagonist's ancient book restoration studio and the female protagonist's criminal police team).
Hidden setting: The city is littered with "ancient inheritors" (people who possess fragments of ancient books and can use weak special abilities) and "abnormalities" (monsters spawned by the energy dissipation of ancient books, such as "Paper Charm" and "Ink Nightmare", the appearance of which is close to the spirits recorded in ancient books, only visible to inheritors or those with special physiques).
Core carrier: "Ancient books" are not ordinary history books, but "information containers" that contain the rules of heaven and earth. They are divided into four categories: "medicine, military, art, and art." Each ancient book corresponds to a core ability, and a complete ancient book can unlock the "real realm."
