Lin Yan, a modern history researcher, accidentally transmigrates to the Dayan Dynasty and becomes the illegitimate son of a frontier garrison commandant at Yunguan Pass. Trapped in a desperate situation and burdened by those he cares about, he draws on modern knowledge and an unwavering resolve to protect them as he fights back on the frontier. He saves low-ranking soldiers and wins the loyalty of trusted aides such as Zhao Hu and Su Jin, using a compassionate rise to power to break the cycle of oppression and relying on strategy and responsibility to secure his place. Threatened within by his legitimate elder brother and the schemes of powerful families, and without by the watchful northern barbarians, Lin Yan defends Yunguan Pass, protects those around him, and claims lost keepsakes. Rising step by step from a discarded pawn, he vows to serve Dayan and lay the foundation for an empire that will endure ten thousand years, guided by the ideal of a diverse and harmonious society.
