The Rise of the Border: from Guarding the Border to Dominating the World

Once time traveled, the protagonist rose up in the flames of war at the border, from rising to prominence defending the city to becoming famous in one battle. After entering the capital and being granted a title, he set foot in the court, displayed his wisdom in power struggles, and accumulated strength outside. After that, they separated one side, developed the economy, trained private soldiers, and became princes to participate in the struggle for hegemony. To compete in the world, he first held the emperor hostage, and then unified the north and south. Finally, a prosperous age was created, the system was reformed, and territory was expanded. See how the protagonist creates a legendary hegemony in the ups and downs.