Gu Ya, the second daughter of the Gu family, was forced to replace her eldest sister Gu Qi, who had escaped from marriage, and entered the palace as a concubine. Emperor Xiao Yin had known her identity for a long time, but he used her as a pawn and an object of temptation while protecting her while forcing her to hand over her true feelings step by step. After entering the palace, Gu Ya was repeatedly framed by Concubine Gao, and she was startled at every step. Xiao Yin tried his best to protect her. Concubine Gao designed to drag Gu Qi into the palace in order to reveal the secret of their substitute marriage. The sisters went from tit-for-tat to being forced to form an alliance, and they finally saw each other clearly. In the end, the two sisters joined forces with the emperor to disrupt the Gao family's conspiracy. Gu Ya finally ascended to the throne and co-ruled with the emperor. Gu Qi left the palace to engage in business and became the richest man in the capital. The sisters stayed with each other inside and outside to protect the prosperity of the Gu family.
