Su Qing, a modern toxicology expert, traveled through time and became Liu Qingyuan, the legitimate daughter of Jing'an Mansion. At that time, she was drowned by her concubine and concubine, and she was about to die in a "fornication" within half a month. With her knowledge of toxicology and resourcefulness, she first broke the ten-day life-and-death situation, and then reached a marriage agreement with Xiao Yu, the frail eldest son. She controlled the economic lifeline by improving Yanzhi, and overturned the old corruption case of the Liu family with the game of etiquette and law. In the process, she revealed her life experience as the orphaned daughter of the late empress, and went from using her to falling in love with Xiao Yu (actually the prince who investigated the case). In the end, she used her wisdom and courage to destroy the decadent clan and gain a new life for herself, her biological mother and the court.
