I Knew the Setting of This Saint Was Unreliable!

"Lin Xing, you really make me feel sick." On a rainy night, my childhood sweetheart watched me getting out of the villain's luxury car disheveled, holding a stack of "dirty money" in my hand, and left the most vicious curse on me. She didn't know that just ten minutes ago, I walked through the door on her behalf and took care of the indescribable thing called "Gluttony". Lin Xing, a senior high school student who traveled to a parallel world, discovered that the world was full of monsters that preyed on "purity." The chosen girls are doomed to destruction in this twisted world. In order to protect these ignorant souls, Lin Xing, who possesses the [Innocent Darkness] physique, was named by Heaven and chose a path of redemption. Every time the mission is resolved, he will gain a body of pain and negligible superpowers, and... All the heroines' memories of him will be completely erased. I always thought that as long as the mission was completed and the memory was cleared, he would still be the same ordinary boy. Until one day, those who were supposed to forget Lin Xing suddenly shed tears when they looked at the scars all over his body... "Hey, isn't this part in the script? Don't cry, I'm obviously just a villain who gets paid to do things!"