On the Great Qian Frontier, What Is This Awakening of the Power to Slay Demons?

[Pure romance] Synopsis: In the three-hundredth year of the Great Qian Dynasty, foreign tribes invade. The Bai Kingdom possesses secret arts for controlling beasts, using them to wreak havoc along the frontier. At the border, seventeen years after transmigrating, Li Taiping joins the army. But after stopping his superior from assaulting a young woman, he is charged with the capital crime of defying his superior. Fortunately, with fighting on the frontier intensifying and troops urgently needed, Li Taiping is assigned to the Death Battalion. Unfortunately, the superior he offended is the Death Battalion’s squad leader, and he very much wants Li Taiping dead. On the day soldiers are assigned wives, the superior deliberately puts the young woman Li Taiping rescued on the list of women he can choose from. He is deliberately setting a trap to torment Li Taiping. Unable to take it anymore, Li Taiping tries to fight back, only to end up on the verge of being eaten alive by dogs. At the critical moment, after biting a vicious dog to death, Li Taiping unexpectedly awakens the Demon-Slaying System. [Ding!][You have slain a third-rank demon, the Crippled Dog (juvenile form).] Li Taiping is stunned. Hadn’t he just killed an utterly ordinary dog? Whatever. “I said, I’m taking him with me today!” Soon, Li Taiping discovers that the System classifies every ordinary animal as a demon! Li Taiping begins a life of purging corrupt officials from the dynasty, starting at the border. Years later, when Li Taiping faces the demons filling the sky as they awaken, he simply raises his sword. “This is the Great Qian Dynasty. Demons are forbidden here!”