Before Signing the Do-Not-Resuscitate Form, My Husband Said the Money for My Mom's Treatment Was Gone

Novels Are Getting Boring. Got Anything Exciting?

A story about the supporting character from Storyline A, where the protagonist follows an invincible path but turns evil later on for some reason and tries to destroy the world, transmigrating to the beginning of Storyline B and accompanying its protagonist to keep him from turning evil.