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Noona literal translation is older sister. In Korea they call noona to older female friends but also to their older female siblings. That's why when a guy introduces his sister to someone he will specify that it's his "shin noona"= real sister. So unless the say it like that people won't think it's his sister but an older female friend.
Ohh ty
I mean idk too much about the Korean language but I'm pretty sure he can't just say "stay away from my sister" bc he'd just use noona and noona is a general term for close female friends older than you (male) by a lil bit. Someone correct me if there's actually a way for him to express that sentiment without making it seem like he's dating his sister lol