Lin Wan, a modern medical student, accidentally traveled into the sadomasochistic novel "Yu Tang Chun" in an imaginary dynasty, and became a concubine of the Hou family who was rejected by her family. The rules of this world are subtly different from the original work, and there are hidden hidden lines that have not been written clearly. Mu Yunzhou, the prince of Zhenbei Hou, is not suffering from an ordinary disease, but "Qian Ji Yin" involving the royal family's secret medicine. This toxin causes different symptoms depending on the moon phase and requires special solutions. Mu Yunzhou, the prince of Zhenbei Hou, is not suffering from an ordinary disease, but "Qian Ji Yin" involving the royal family's secret medicine. However, this seemingly peaceful Hou Mansion actually hides the remnant forces of the previous dynasty. The Taiyuan Hospital secretly colluded with the Minister of Household Affairs to build a huge monopoly network on medicinal materials.
