The protagonist, Lin Yan, is a restorer of ancient books. He also has a photographic memory and a keen intuition of semiotics. On the surface, she is a craftsman with a gentle personality and a regular life. She is used to using a magnifying glass to observe details when repairing ancient books, but secretly she hides a secret - she can "see" the remaining fragments of memory by touching old objects. This ability makes her particularly sensitive to the secrets behind history, and allows her to always find clues to solve the problem from the details when facing danger.
