For a thousand years, humans and demons have fought. There is only one way for humanity to grow stronger: replace their own flesh, sinews, blood, organs, and even bones with those of demons.
The closer you get to demons, the stronger you become.
Nie Xiaoqi, the son of a constable, was deceived by his family. His own cousin stole the opportunity meant for him, took the constable's position left behind by his father's death, then tricked him into entering the Bloodbone Sect and threw him into a blood spring, expecting him to dissolve into a pool of blood and decorate the spring.
Watching his childhood friend dissolve into blood before his eyes, Nie Xiaoqi finally understood the cruelty of this world. They were nothing more than fodder for the blood spring! At the brink of despair, as he floated in the torrent of the blood spring, Nie Xiaoqi saw a prompt window.
Ding!
[Prompt: Instead of waiting for death, why not become a demon and fight back?]
From then on, he donned demon hide, fused with demonic sinews, replaced his flesh and blood, refined demonic organs, and swapped out his skeleton, transforming himself into a demon inch by inch!
By the time he had secured his footing in the Bloodbone Sect's whirlpool and personally reclaimed everything that belonged to him, nobody noticed that his eyes were no longer pure. They glowed a blood-red light as they turned toward the whole world!