Gu Qingyan, the legitimate daughter of the Yongning Marquis Mansion, invited herself to the palace as a seven-level promise in order to clear her brother who was wrongly imprisoned for collaborating with the enemy. Faced with the Queen's troubles and the concubines' schemes, she used gentleness as her armor and intelligence as her blade. She worked her way through the turbulent palace step by step, determined to get close to the emperor Xiao Che, and vowed to find out the real culprit behind the scenes, protect the prince's palace, and restore her brother's innocence.
