looking for any novel where the mc is apart of an evil or secret organization that goes against society
The Raven Dark Hero ~I Longed to Be a Hero but Due to This and That I Became the Last Boss?!~ Ototsukai wa Shi to Odoru Ouroboros Record ~Circus of Oubeniel~
Not sure about novels other than those mentioned already, but I do know some good manga/webtoons: Ranger Reject (manga) Mr. Villain’s Day Off (manga) Villain to Kill (manhwa) EDIT: Makai Hongi, Goblin Kingdom, My Death Flags Show No Sign of Ending, and Demon Noble Girl ~Story Of A Careless Demon~ might all hit close for you.