no the sister is older. maybe they have huge age gap. that's why his sister call him baby. you can't help but vieiw them as a child/baby because you're the one who take care of them... well from my exp.
idk where you get the idea of oppa because it stated multiple times 'older sister'
I got that idea because the meaning of oppa is varied and a lot of times can also mean how a girl calls an older guy who can be her boyfriend by that name. And I didnt catch the older sister part being emphasized, because as far as i know, the author went as far to imply she could be his gilrfriend by showing the clothes on the floor and stuff.
And otherwise, baby as in a lover would be jagi. The literal meaning of baby, aegi, would only be used to refer to actual babies or as a way of speaking but never to your significant other. If she wouldve called him baby brother; dongsaeng, there wouldnt be any mixups either. So that was the only logical thing left
I totally call my brothers baby, not in a weird way just like funny lingo?
No i absolutely get that, but i also keep in mind its being translated from a different language and in that context, it wouldnt be fitting nor does it make sense for it to be a mixup in that particular language
Okay but who the hell calls their brother 'baby'.
On second thought, he might be older than her and Selena is calling him 오빠/oppa.