Jiang Bei, a young man from the modern era, unexpectedly travels through time to Tiemenguan in the Great Qian Dynasty, becoming an ordinary soldier in a frontier garrison. Mistakenly believed to be without heirs, his original host body was sent to a border military camp where survival was almost impossible. Jiang Bei refuses to back down. Remembering his duty as a frontier soldier, he leads charges into battle and repeatedly earns military merit, gradually rising from an unknown foot soldier. Some fellow soldiers fear his abilities and secretly conspire with foreign enemies to frame him, but Jiang Bei survives their schemes through his vigilance and strength. After winning repeated victories at the border, he earns a transfer order through his own achievements and reunites with his wife, Yu Rou, who has been waiting for him for a year. From then on, he protects his family and defends his country, using his military achievements to rewrite the fate of himself and his loved ones.