During the reign of Renzong, wars continued on the border between Song and Xia, and there was an undercurrent of competition for the throne in the imperial court. [Lin Fu] was originally a small soldier guarding the border. He was transferred to the capital based on his military exploits, but he was accidentally involved in the whirlpool of the prince's succession. Armed with modern military knowledge, he improved weapons and tactics, and defeated the Xixia Iron Troopers at the border. Faced with the conspiracy of the second prince to collude with his relatives, he adhered to his original intention of serving the country, and was forced to take sides despite not being involved in party disputes. Su Qingyuan, the daughter of a civil servant, secretly conveyed information about the court and helped him navigate step by step between the court and the military camp. In the end, Lin Fu assisted the wise eldest prince in uncovering the conspiracy and stabilizing the government. He not only safeguarded the peace of his family and country, but also fulfilled his lifelong ambition to serve the country.