Frontier Overlord: from Exiled Son to Lord of Ten Thousand Miles

At the beginning of the time travel, he was jumped by an immortal and was directly demoted to the frontier to drink the northwest wind? The emperor wants to trap me in a border town, and the courtiers are waiting to see my jokes? Little did they know that I had modern knowledge in my hands, reclaimed wasteland, refined steel, and trained cavalry. In three years, the frontier had been completely transformed! On the day when the cavalry marched across the grassland, the princess of the enemy country knelt down and begged for marriage, and the emperor on the dragon throne regretted it to his heart - the son he had exiled was not an abandoned son, he was clearly a hidden dragon from the Great Zhou Dynasty! "Your Majesty, this frontier of thousands of miles belongs to me now!" Exile is just the starting point for my dominance!