Savior? I Accept Your Sins!

When I woke up, I transformed into the world-destroying demon king in the novel. When he opened his eyes, he saw the hero and heroine leading an army of tens of millions approaching the city. According to the plot, I was supposed to be pierced through the heart with a sword and sealed forever. Unexpectedly, before I died, I suddenly heard the system prompt: "The evil deeds exchange system is activated - the evil deeds you have done are being converted into combat effectiveness..." "Calculation completed, congratulations on becoming the strongest demon king in history!" Just when I excitedly raised my hand to crush these ants, But I suddenly realized that the system was not counting my evil deeds—— It's the dirty secret behind the protagonists known as the "Messengers of Justice"…