Late at night at the "Shiguang Ancient Books" bookstore in the old city, history student Lin Shen touched the thread-bound version of "Zi Zhi Tong Jian" among the old books at the bottom of the box. The dark hardwood cover was filled with the coolness of the years, and a brown and yellow scrap of paper was sandwiched between the rice paper pages. The handwriting of "Tomorrow at noon, history will ask you for the first time" was stained with mold, like a prophecy that spans time and space.
He threw it into the wastebasket as a prank, but was dragged into the "Long River Trial" by a strange caller at noon the next day: he suddenly fell into the ruins of Suiyang during the Anshi Rebellion, and could only use a rusty knife to protect civilians from the purgatory of "men killing women and kidnapping"; in the blink of an eye, he crashed into the 1984 college entrance examination examination room, relying on his "photographic memory" Skills rewrite the fate of failure; when he transformed into a township agricultural technician, he struggled to promote hybrid rice on the loess despite doubts and pests; when he went deep into the Dunhuang Mogao Grottoes, he saw that the Feitian murals "lived" into a life-threatening illusion, and he needed to crack the "Feitian code" to escape; he even had to establish a technology company in Pengcheng in the 1990s to resist plagiarism and overcome financial difficulties.
Su Qing always appears at the critical moment of life and death - her life and death partner in the Suiyang battlefield, and her puzzle-solving partner in the Dunhuang maze. Her identity hides the puzzle of the system. When the "causal perception" reveals the heavy price of each intervention, and when the truth behind the "long river" behind the nine trials gradually emerges, Lin Shen clutches the Dunhuang fragments and the historical temperature, breaks through the gap in time and space, and also walks out a path of growth from a young student to a strong person in the trial.
