Lin Yan, a modern history researcher, accidentally traveled to the Dayan Dynasty and became the concubine of the Yunguan Border Guard Colonel. He was in a desperate situation and had a weak point. With modern knowledge and protective obsession, he fought back in the desperate situation on the border, rescued low-level soldiers, subdued Zhao Hu, Su Jin and other confidants, broke the oppression with warm counterattack, and stood firm with his strategy and responsibility. With his brother-in-law and his family in trouble, and with the Shuofang barbarians watching from outside, Lin Yan guards Yunguan, protects those around him, and seizes relics. He rises step by step from an abandoned son, determined to assist Dayan, and lays the foundation for a ten thousand-year emperorship with the idea of diversity and symbiosis.
