Gu Ci, the little general of Zhenbei, disguised herself as a man to join the army in place of her brother, only to be framed and forced into marriage by the Chancellor. Her identity was exposed in the golden hall, and the Gu family fell into the capital offense of deceiving the emperor. Crown Prince Xiao Qinghe stepped forward to protect her with the status of Crown Princess, but in reality, he used military power as a stake to pull her into the game of power struggles. A palace coup suddenly broke out, the late emperor passed away, and the two shifted from scheming against each other to joining forces to break the deadlock, helping the Crown Prince retake the throne. After ascending the throne, Xiao Qinghe kept her with the title of Empress of the Middle Palace, but Gu Ci rejected the phoenix palace, held mighty troops, and led thirty thousand Gu family troops to guard the thirteen cities of the northern border forever. From then on, the rivers and mountains belong to the monarch, and the heaven and earth belong to me.