Apocalypse Villain - hiding in the hero's group

This novel is reposted and continued under a new name - Apocalyptic Game: Revenge of the Reborn Villain.
If you like the idea and want to finish this reading journey, check that name in search and download it.
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It was only after Damian died miserably that he learned that the young man who shouted about love and friendship all day long was the male protagonist, the one destined to save the world, and he was just a minor villain, a stepping stone for the hero along the way.

Because Arthur is the hero, he, who has a cautious personality will ignore the opponent's threat and let him grow.

Because Arthur is the protagonist, every fatal move he makes has no effect.

Because Arthur is the protagonist, even his loyal men will be inspired to rebel.

Because Arthur is the protagonist, every strong girl will open her arms and welcome him to join their camp after seeing his smile.

Now, after regaining his life in the past through the rebirth, Damian had three choices before him -:

1) Just like in the previous life, fight hard with the protagonist and try to find a way to kill him.
(Yeah, good luck with that dumbo..)

2) Don't be a villain, and seek a way out. Hide from the hero and heroines
(Like fate would let you, silly..)

3) Join the hero's group and act like a righteous little brother.
(That means forgetting everything he went through, can he..)

Damian looked at all three plans carefully and reordered them instantly.

He wants to join the hero's group like a righteous person, and then find a way to kill the damned protagonist.

"You think the story ends with you saving the world? But guess what, I’m rewriting the script.
This world isn’t worth saving. And if I have to destroy it to kill Arthur, then so be it."
And thus the world witnessed the birth/rebirth of a true villain.

XXX---XXX

Note -: It's a post apocalyptic fantasy novel. With zombies, mutation, evolution and some super powers kinda stuff.
-MC is a proper cruel villain. Not at the level of being totally emotionless but not quite far either.
-The hero is a proper protagonist. Not like those double standard guys from random cn mtl novels who're more villainous than so called villains.
-No harem. No heroine.