On the day Yun Ning, the illegitimate daughter of the Duke's mansion, is reborn, she happens to catch her legitimate elder sister, Yun Shu, secretly entering the Red Sleeve House to compete for the title of top courtesan. In her previous life, Yun Ning desperately tried to stop her, only to suffer endless torment at her sister's hands after Yun Shu ascended to the throne as empress. This time, Yun Ning simply smiles and lets her have her way. Her sister personally throws away the Duke's jade token, beginning as the courtesan Peony and eventually making her way into the Eastern Palace, where she poisons witnesses and murders the deposed Crown Prince. Meanwhile, Yun Ning joins forces with Xie Feibai, the playboy young marquis, to bring down the Crown Prince and quell the Third Prince's attempted palace coup. As the grudges of two lifetimes finally come to an end, Xie Feibai's true origins are revealed. But what else lies hidden behind the throne's supreme power?