The Nerd Turned Out to Be the Tyrant

Read manhwa The Nerd Turned Out to Be the Tyrant / The Nerdy Man Turns Out to Be a Tyrant /  陰キャな幼馴染が実は暴君でした /  너드남이 알고 보니 폭군이라 합니다
I’ve been reincarnated into an R-19 dark romance novel where the tyrant runs amok and kills all the characters.
But it’s okay since this is a remote countryside village far from the imperial palace, right?
All I need to do is live a peaceful life with my quiet childhood friend, “Lev,” who loves books.
He’s so kind and innocent, how can anyone not love him?
…I didn’t know then. My nerdy childhood friend…
is the tyrannical crown prince male lead in the novel?!