Jinyiwei: I Get Stronger by Killing Demons

A modern youth accidentally transmigrates into Chen Qingzhou, an elite guard of the Great Wu Dynasty. After waking up, he is ambushed by the magistrate's henchmen. In a life-or-death struggle, he awakens a system that grants immense power for killing demons, causing his combat abilities to skyrocket. He travels through the realm, slaying demons and investigating the magistrate's sinister conspiracy of colluding with evil spirits and massacring the people. From investigating a case alone to sweeping through demon caves and defeating numerous evil forces, he exposes the true demonic nature of the Imperial Preceptor and the false emperor. Chen Qingzhou, as an elite guard, slays demons, counters his enemies, and upgrades himself. Relying on the system and his strength, he clears the chaotic world of demonic plagues, ultimately protecting the nation and people while seizing control of the world.