I Helped the Good-for-Nothing Prince

Su Yun transmigrates into the world as the groom of Li Cang, an exiled prince, and from the start faces harassment from the border commander and a fight for his life. After awakening a System, Su Yun quickly strikes back, seizes power from the commander, and recruits his scattered troops. He then uses the System to find talented people, resolve the food and supply crisis, and improve military equipment. When the barbarian tribes invade in force, Su Yun turns the tables against the odds, not only defending the northern frontier but also forging an elite army of fierce warriors. He advances step by step, exploiting the political situation at court and riding the momentum of his great victory back to the capital. There, he clears his name and ultimately helps Li Cang ascend the throne, becoming the most powerful minister in the empire.