Heroine: Su Qingyan, the legitimate daughter of the Duke of Zhen Guo. She was secretly exchanged by Liu Yuru when she was a child. She was fostered in the Su family (a merchant's home) and married into the Marquis of Jing'an for three years. She is proficient in the Xuan Yue secret technique (fighting poison with poison + insect control), has precognitive dreams, and has a cool and decisive personality. Her goals are to protect the Duke of Zhen Guo's palace, find out the truth about the exchange, and take revenge on Liu Yuru and the fake daughter.
