Modern young man Li Qianyi transmigrates into the Great Yong Dynasty and becomes the heir of the Prince of Yanbei. Immediately caught in a trap after his transmigration, he uses his intelligence to overcome the crisis. Later, he speaks up for justice at court and earns the emperor's attention. He gathers talented and capable people from all walks of life, steadily building his strength. He is subsequently ordered by imperial decree to marry the exceptionally talented and beautiful Lin Xian'er, and the two work together as one. While navigating court affairs and uncovering hidden entanglements among various factions, he accompanies the army to the frontier to repel foreign invaders and achieves outstanding military victories, earning the title of Marquis of Zhenbei. After weathering numerous trials and political upheavals, Li Qianyi secures his position at court, while his companions each find their own happy ending and embark on a new chapter of life.