When Cheng Yanbai passed the biology laboratory for the seventh time, the siren suddenly screamed and sprayed out fluorescent powder - the girl who got into trouble holding a copy of "Yongle Dian" had the remains of Song Dynasty porcelain stuck to her hair. Lin Zhaoxia didn't know that the Ming Dynasty medical classics she rescued contained fragments of the Dunhuang star map, nor did she find that the cuffs of the boys' overalls in the architecture department had coordinates in Xixia written on the tip of a needle. When the blue light of the electron microscope illuminated the cracks in the porcelain tiles, they were surprised to realize that those winding golden lines had outlined the radicals of each other's names as early as three years ago. At this moment, the sandalwood in the ancient book library is seeping into the pine wood model, and the Medicine Buddha in Cave 220 of the Mogao Grottoes is staring at this reunion that is thousands of years late in the mottled murals.