Gu Han, a modern special forces soldier, unexpectedly travels through time to the northern frontier of the Great Qian Dynasty, where he becomes a low-ranking squad leader of ten soldiers who is gravely wounded. At the very beginning, female relatives of convicted officials are being sent to the frontier and assigned to soldiers. In the crowd, he recognizes his fiancée, Lin Wan'er, and her family. To save her entire family, he exhausts all his military merits and even cuts his palm to sign a life-and-death pledge, advancing his future battle merits. In the end, he is stripped of his military rank and sent to the Suicide Squad, a battalion where survival is almost impossible. In this desperate situation, Gu Han successfully activates the Peerless Military Engineering System, which restores his severely injured body through marrow cleansing and physique refinement, and grants him a 130-jin meteorite-steel horse-cutting saber and the Eight Desolations Formation-Breaking Saber Technique.