Not sure if i’m gonna get all the details right because i read this a long time ago but basically there was this human guy who had to be a teacher in an all monster/evil school that teaches students that are basically monsters and evil so he had to pretend he was also evil and not let his students find out he was a human or else his students would kill him and it was kinda funny because he was trying his best to survive (he was the only good/human person in the school i believe) it was also a manhwa/webtoon