Returning from Hell, I Have Sealed My Heart with Cement and Lost All Emotion

[Blackened + System + Ruthless + Knife] If kindness was a sin, would you be willing to make the same mistake again and again? If you were given a chance to be reborn, would you turn to the light, or would you choose to fall into the darkness? For these questions, Lin Fei already had the answers in his mind after his rebirth. "I would rather teach me to betray the world than teach the world to betray me. In this life, I will only live for myself!" (Note: There is no female protagonist in this book, only tool characters.)