Shen Zhaoning lives in the Prince Chen's residence as a substitute bride and princess consort. At a victory banquet, her multiple identities are unexpectedly revealed. Holding tokens of recognition from several nations and protected by the late emperor's final decree, she sees through the entanglements between the prince's household and the imperial court. She chooses to divorce and free herself from an unhappy marriage. When chaos caused by the northern frontier's barbarian tribes threatens the people, she puts aside her personal grievances, takes command of the military tally, unites various forces, and heads to the front lines. With her wisdom and strength, she overcomes the enormous crisis and eliminates long-standing corruption in the imperial court. With the welfare of all people at heart, she ultimately shoulders the responsibility of ruling the realm and ushers in an era of her own.