Su Jin, a top modern herbalist, traveled through an experimental accident to a dynasty that did not exist in history - the Dayin Dynasty. Her soul was possessed by the daughter of an imperial physician who was enslaved in the palace because of a crime committed by her family. Faced with the exclusion from the imperial hospital, the dangers of the palace, and her own humble situation, she relied on her superb knowledge of modern medicine and superb pharmaceutical skills to climb up the ladder step by step from the lowest servant palace maid. She cured strange diseases, prepared incense, defused conspiracies, and even affected the structure of the court. However, as she became famous and attracted the attention of the ruthless king, crises also ensued. With the unfathomable emperor's heart on one side, and the fog of injustice against the family in the past on the other, how can Su Jin preserve herself, realize her ambitions, and find her own way back in the heart-wrenching palace?