Lin Xuan, a special forces soldier, transmigrates into the body of a substitute for the Crown Prince of the Great Qian Dynasty. Unwilling to take the punishment meant for the real Crown Prince, he kills the prince and assumes his identity, only to be discovered by the Crown Princess, Shen Qingyi. The two form an alliance to survive. When Third Prince Lin Fu repeatedly schemes against him, Lin Xuan turns every plot against its mastermind. To save his father-in-law, Shen Wenyuan, Lin Xuan temporarily takes charge of the Capital Prefecture and discovers that the missing official grain is hidden in the estate of Duke of Zhenguo Qin Lie, clearing the wrongful accusations and winning valuable support. Before the Six Nations' hunting competition, Lin Xuan recruits young men, selects two hundred elite soldiers using modern military training methods, raises military funds through printing and commerce, and equips his troops with repeating crossbows and light armor. During the competition, he sees through an ambush and joins forces with the Northern Di and Yan armies to defeat the coalition, helping Great Qian claim first place.