I can recommend you the book,"Quick Crossing: The System to Stop Villains". The main character, Mu Zihan, obtained a villain system and decided to help the villain become a good young man with upright values. The mission was very successful. This was a fast-moving novel. The apocalyptic theme would also appear in it, and the protagonist would also take the villain's route. At the same time, there would be some exploration of the emotional aspect. I hope you like my recommendation. Muah ~