The Nerd Turned Out to Be the Tyrant

Read Manhwa The Nerd Turned Out to Be the Tyrant: 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?!