Ten years ago, a bizarre secret room murder shocked the peaceful Nancheng. Well-known architect Lin Wenyuan died in a locked studio, leaving only half a vague fingerprint and a sketchbook filled with strange symbols at the scene. All the evidence pointed to his apprentice Jiang Zhe, but at the critical moment, Jiang Zhe disappeared as if from the world, and the case was finally sealed in the deepest part of the police archives with the label "suspect at large."
