Villains' Absolution is the trope/phenomenon describing that some villains give up their evil ways to become good. This event is essentially a form Heel-Face Turn scenario where a villain decided to become a good guy, though in Villains' Absolution's case, the villain would reflect the error in their ways and sees that in spite of how far he/she go in the path of evil, he/she realized that he/she still have the chance to return to the good side.