The infamous princess Qin Jinzhi returned to Beijing after being sent to a temple for three years. On the surface, she was arrogant and domineering. She beat the prince angrily in the street and forced her to marry Pei Jinnian. In fact, the palace was very deep. Using her naughtiness as a mask, she worked step by step to find out the truth about her poisoning and find medicine for her grandmother. Behind the scenes, she hid the secret of going on an expedition for the country and capturing the enemy's prince Huangfu Nanfeng alive. As the sharp sword in the hands of the emperor, she established the "Thousand Bird Guards" and recruited her love rival Cui Ying as her deputy. She dealt with the princes who had their own ulterior motives, provoked infighting among the families, and defeated the family forces that threatened the imperial power one by one. In the treacherous court of Bo Yun, she transformed from a "notorious princess" to a behind-the-scenes power player who can compete with all parties.