Science student Li Che travels back in time and becomes a prince sent to the lands beyond the Great Wall to take the blame for others. Everyone expects him to fend for himself and perish. However, he recruits death row prisoners, invites great scholars, and uses modern knowledge to reform firearms and military formations, stabilizing people's hearts amidst border crises. Facing court contempt, grain pressure, and invading barbarians, he breaks through difficulties with strategic wisdom, building a new situation for Daqing, making the capital recognize his weight for succession once again, and reigniting the morale of the border army.