Ancient Immortal Killing Record

In this world, there are monsters, fairies, monster control masters, demon exterminators, ascetics, immortals, saints... Since a thousand years ago, the human world has been chasing the demon world, but are humans the righteous party? Far more terrifying than demons is the human heart. The seventeen-year-old boy, Han Yan, was originally a Taoist, but gradually saw through the despicability of the human world, turned into a demon, and decided to kill the immortal, break the law of heaven, reshape the order of the human world, and rectify the name of the demon world.