The story takes place at the end of the fictional "Five Dynasties and Ten Kingdoms", when the world was falling apart and war was raging. The Kingdom of Southern Chu was broken, and Princess Chu Wanning was sent to the most powerful Northern Yan Dynasty as a hostage. In Beiyan, she was humiliated and treated as a plaything. In order to protect herself, she relied on the history books and political classics she had read since childhood, as well as her precise insight into people's hearts, and began to dance on the tip of the knife. She secretly observed the overt and covert struggles of the princes of Beiyan, and finally chose to form an alliance with the most disliked "guardian" who was sent to guard her - the ninth prince Xiao Ce.
