Background: During the Zhengde period of the Dayin Dynasty, the Imperial Medical Office sentenced Su Wenyuan to death for "developing immortality medicine", and his daughter Su Qinghe was implicated and exiled for three years. When she returned to the Su family's old house in exile, she discovered that the scent of medicine in the courtyard lurked murderous intent - her eldest uncle and second aunt were like puppets, the family was controlled by a secret medicine from the Western Regions called "Immortality Cream", and the medical records left behind by her father clearly recorded the fatal connection between "March Dementia" and "Chronic Poisoning of Forgotten Grass".
Su Qinghe used medical skills as an edge to peel away cocoons from the medicine residue in the old house, the poisonous marks in the wells, and the remnants of the imperial hospital, and gradually uncovered the chronic poisoning situation implemented by the third prince's mansion in the name of immortality. As the investigation deepens, she discovers that her father's death, family changes, and palace intrigues are intertwined, and the key clue is actually hidden in a mute maid, A Ying, who has a mole at the end of her left eyebrow. This orphan girl claims to be "born deaf and mute."
