When Su Tang, a restorer of modern intangible cultural heritage and traditional lacquer art, took over the "Tang Lacquer Pavilion" lacquer art studio left by his grandmother, he accidentally discovered a incomplete "lacquer box with red lotus pattern" from the Song Dynasty and a "school lacquer compass" engraved with lacquer art patterns. This lacquer box hides the "five-color paint code", which is not only related to the recovery of the lost lacquer repair technique "gold lacquer patchwork", but also connects the passage of time and space spanning eight hundred years. With the help of the compass left by her grandmother, Su Tang established a connection across time and space with Shen Yanzhi, a craftsman responsible for the restoration of royal lacquerware in the Song Dynasty. While cracking the code and searching for lacquer box fragments, the two dealt with emergencies at the lacquer art exhibition and the covetousness of cultural relic dealers. In the end, they not only restored the "gold lacquer repair technique" and protected the millennium lacquer art repair technique, but also gained a deep bond in cross-generational collaboration, interpreting the true meaning of "lacquer art repair is not only to repair the paint surface, but also to preserve the craftsmanship and pass on the lacquer soul."