212 makes fun of shoujo tropes, explores ramifications of living in a book world, and examines friendship, it's really interesting, plus the mystery of why she's there and when she might return is always there, it's a very refreshing and interesting spin on traditional "in a book" shoujos
Edit: omg this is tearing my heart out stomping on it and shoving it back in full force, I seriously can't wait for the next season it's so good give me moreeeeeeee waaaaaaaah
Inso's Law Webtoon