Lin Wei, a modern cultural relic restorer, was forcibly bound by the "Trick System" while repairing a Tang Dynasty bronze mirror engraved with Cthulhu's treacherous pattern, and was involved in a world of infinite copies that integrated the Cthulhu mythology. The system uses "sanity value" as the energy unit to issue exploration, decryption, and survival tasks. If it fails, the consciousness will be swallowed by the "indescribable existence". Lin Wei needs to rely on the observation and logical reasoning skills of a restorer to survive in the strange copy and at the same time uncover the truth: the bronze mirror is an ancient "sealing device", the system is a failed product of human research on ancient existence, and her family is the "Seal Guardian" and has been engaged in a thousand-year game with the Cthulhu forces. The dungeon world increases according to the "threat level", from low-level "deep divers" to high-level "outer gods", gradually revealing the tip of the iceberg of cosmic-level terror.
