i'm actually going to mention that during ch 15! talking about languages they're 100% fluent in the story: H - KOR/ENG, L - ENG/KOR/ITA, B - FRA/ENG/KOR, S - ENG/KOR/ESP, J - ENG/KOR/FRA/JP/ESP, K - KOR/ENG/FRA. they usually speak in english with each other, sometimes they switch like bae and jiwoo when they want no one to know what they're talking about. some of them switch to some specific languages when they get angry etc it's pretty fun to play with that.