Su Ningwan, the daughter of the prime minister, was accused of treason overnight and her entire family was executed. She narrowly escaped death and was rescued by a hidden poison doctor. She spent several years learning extraordinary poison techniques and strategies. In order to take revenge, she changed her name to "Lin Wan" and entered the palace as a female tutor, becoming the teacher of the most unpopular and sickly seventh prince. She disguised herself with a weak appearance, secretly using poisonous skills and ingenuity to clear obstacles for the seventh prince, win over allies, and push him step by step to the center of power. During this period, she and Xiao Jue, the cold-faced commander of the Forbidden Army who was responsible for monitoring her, gradually changed from enemies testing each other to each other's only trust and reliance. Su Ningwan's road to revenge involves thrilling battles of wits with noble concubines, powerful ministers, and even the most powerful emperor. In the end, she revealed the truth about the family injustice, overthrew all her enemies, and assisted the seventh prince to ascend the throne as emperor. She became the number one person behind the scenes controlling the government and the opposition, and achieved the most complete revenge.
