Traveling through time and becoming an unknown official in ancient times, the protagonist discovers that his diary can rewrite reality - but every time he writes a "future", he needs to build a precise causal chain, otherwise it will be ineffective. When the diary was submitted to the Dragon Case, he was named "National Preceptor". Everyone in the court thought he was prophesying, but little did they know that he himself had become a pawn imprisoned in the cage of cause and effect.
