Villain Saving System (BL) - Chapter 83 - 3.23 Let Me Help You

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

The hero who was killed by the demon king ended up reincarnated as the son of the one who killed him! Thus began the life of the hero who donned in the mask of the ideal demon prince to topple his own kingdom while doing his best to prevent anyone from discovering his identity―― But to do that and blend into the demon tribe society, he had to kill his former comrades. Nevertheless, to become stronger, to save humanity, he had to walk through all kinds of paths of carnage! This is the tale of the demon race’s fake prince destroying his own kingdom.

O Hero, Trample Those Who You Should Protect!

TN: Most part of the other character in the novel is depicted from a non-human perspective so expect something that is completely different from the common sense of human.

Hoo hoo hoo, the Director has fallen! (crying)Don't... don't rush to call an ambulance, just help me up first!After staying up late playing games, Fang Ye woke up to find himself transformed into the director of a rundown zoo, having a docile and perceptive Amur tiger, a ferocious and haughty silver fox, a gray wolf that enjoyed showing off its relationship...As the zoo developed, its array of charming animals began to attract visitors from all over the world.“Why do all the animals like me?” Faced with the curious questioning of children, Fang Ye looked up at a 45-degree angle into the sky, speaking in a tone that was deep and mysterious, “It all started on a breezy and sunny evening...”

“Send me to the past.” That’s how the first step toward revenge began.