My mother is good at both medicine and poison, and she is reborn to kill people

Su Huan, a top killer of a mysterious organization in the 23rd century who was both a doctor and a poisoner, died accidentally when the plane she was riding exploded on her way back from a mission. By chance, her soul traveled through another world and was reborn as the legitimate daughter of the Prime Minister's Mansion of the Cangfeng Empire in the Tianlan Continent. The original owner's biological mother died early, and she was not loved by her grandmother and father since she was a child. Her stepmother was insidious and cunning, making her suffer all kinds of torture, and even designed to push her into the lotus pond and drown her. Since she is here, we have to take revenge. Those who bully her, humiliate her, and harm her will be repaid a hundredfold and a thousandfold! But, a certain "sick and disabled king", what the hell is going on? We agreed to live together and not interfere with each other, what do you mean by putting pressure on me! A certain prince looked...