Lin Wan, a modern medical student, unexpectedly transmigrates into the tragic romance The Spring in Yutang, set in a fictional dynasty, becoming a concubine-born daughter of the Marquis’s household whom her family despises. The rules of this world differ subtly from the original story, concealing plot threads that were never written down. Mu Yunzhou, heir to the Marquis of Zhenbei, is not suffering from an ordinary illness, but from “Thousand Mechanisms,” a poison involving a secret imperial medicine. Its symptoms change with the phases of the moon, and it requires a special cure. Mu Yunzhou, heir to the Marquis of Zhenbei, is not suffering from an ordinary illness, but from “Thousand Mechanisms,” a poison involving a secret imperial medicine. This seemingly peaceful marquis’s residence is actually hiding the remnants of the previous dynasty. The Imperial Medical Academy and the Vice Minister of Revenue are secretly colluding to build an enormous network monopolizing medicinal ingredients.