La villana es una marioneta, 1

This work presents Princess Cayena Hill, the most beautiful in the empire, but the only thing she knows is luxury and corruption. Her brother is a tyrant who has used her to gain the throne, and her husband, driven by madness, ends up murdering her. At least, that's how the novel that our protagonist reads ends just before ending up in the story, now as Cayena herself. What will he do to avoid the fate he knows?