Kill Monsters to Increase Your Cultivation Level, and Become a Saint Starting from Catching a Police Officer

This book is also called "The REN Demon Must Die" The false demon-slaying guard: working diligently to slay demons and praying for a world free of demons. The real demon-slaying guard: There are no demons in the world? Then cultivate it yourself and let the demons in this world dance wildly! Gu Ming travels through the troubled times of demons, accidentally awakens the demon-slaying spectrum, swallows the demon's lifespan, and burns the lifespan to improve the progress of the technique. A book of demon-slaying manuals to slay all the evil spirits in the world. All things in the world, and all intelligent beings, can transform into demons. Human beings are the first of all spirits, and those who have monsters in their hearts can also be called monsters. If he is a demon, he must die! But if I am the biggest monster in the world. Then, who can kill me? (PS: The character of the protagonist in this book is, well, a bit twisted, so please don't enter if you mind.)