I Will Try to Raise the Villain Who Killed Me

※ This work is being serviced simultaneously on Ridi Webnovel in both 19+ and 15+ versions under the same title. Some scenes and story developments may differ depending on the age rating, so please select your preferred version before reading. I failed to save a crumbling world and died at the hands of a villain. Then, I traveled back 15 years in time and came face-to-face with that villain while he was still a child. You're wondering if I should kill him now that I've regressed to prevent the end of the world? No? Why would I?! This wretched world deserves to be completely destroyed. If I teach him well from a young age, maybe he'll destroy it even more magnificently? Let's raise this b...