Great Tang: Princess Changle Exposed My Identity

The Tang has a Duke Who Guards the Nation, peerless in both letters and arms. Lin Xuan transmigrates to the Tang and leads the seven thousand White-Robed Army soldiers granted to him by the System. He defeats Jieli Khan on the banks of the Wei River, charges through the enemy ranks seven times, and earns undying glory before withdrawing from the world in Lantian. To honor his achievements, the court bestows on him the title of Duke Who Guards the Nation, but no matter how hard they search, they cannot find him. One day, a young girl comes to the county seat and accidentally falls into the water. Lin Xuan saves her with CPR. Afterward, the girl often visits Lantian with a middle-aged man and her little sister, Princess Linchuan. Then one day, the middle-aged man leans close to Lin Xuan's ear and says with delight, "Duke Who Guards the Nation, I knew it was you!" "My daughter likes you quite a bit. How about coming out of hiding and becoming my son-in-law?" "You'd become a prince consort and be granted a royal title one rank below the emperor's!"