Borzijit Yunshu, a descendant of the modern Mongolian ethnic group, passed through the soul of Princess Ning'an of the Xuande Dynasty. She was bound to the "Prosperous Age Harmony System" and dealt with the Ming court and the Mongolian tribes as a nuptial daughter. Wanyan Lie, a descendant of the Jurchen Wanyan clan, was reborn as a border garrison in the Xuanfu, relying on the "Border Barrier System" to consolidate the army and resist foreign aggression. The two protagonists are twin-bound due to the system, from the suspicion and opposition of contradictory national positions to working side by side to protect the mountains and rivers and integrate the ethnic groups. On the eve of the Tumubao Incident, with modern vision and the power of the system, amidst the strife in the Ming court and the war on the border, they paved a road for integration across ethnic groups for the symbiosis of the Han, Mongolian and Jurchen ethnic groups and the stability of the Ming Dynasty.
