Jiang Bei, a young man from the modern era, dies unexpectedly and transmigrates into the Great Qian Dynasty, becoming an ordinary soldier in the Death Battalion stationed at Iron Horse Pass on the frontier. Facing barbarian invasions, desperate struggles for survival, and conspiracies within the military camp, Jiang Bei awakens a mysterious Merit System that grants merit points for killing evil enemies, allowing him to instantly advance his martial arts cultivation. Starting as a soldier on the brink of death, he relies on his intelligence, strategic skills, and the system to rise against the odds through repeated life-or-death battles. He slays powerful barbarian foes, breaks through martial arts realms, exposes his fellow soldiers' schemes, protects his wife Yu Rou, and gradually escapes the fate of the Death Battalion to become an unparalleled powerhouse who strikes fear into the frontier.