Angel

If you're into thriller creature sort of K-dramas like "All of us are dead", "sweet home" then you'll probably like this one. I really enjoyed it and i loved all the characters, and it had a lot of funny comedic scenes too, with a tiny bit of romance here and there. However the ending traumatised me and made me cry and depressed, the writer is delusional for creating that ending. Justice for all the students :(