Jiang Lingxi was a concubine and was forced to marry the sick prince on behalf of her sister. The eldest sister died suddenly shortly after the marriage, and she was taken back to the palace to renew her relationship. She discovered that the cause of her sister's death was poisoning by the prince's former concubine, which the prince knew but condoned. Jiang Lingxi pretended to obey, secretly collected evidence, and teamed up with the demoted concubine to bring down the concubine. In the end, she settled down as the princess, but found out that the prince was not sick at all, and that everything was a trap set by the prince to seize power.
