" 안녕하세요 virtuonweb 입니다 "이번 글에서는 언니, 오빠, "~씨" 에 대해 알아볼까 한다. I know new Korean learners are sometimes taught to use -씨 when referring names. They are also taught not to call anyone 언니/오빠/선배 unless the older person specifically says that we can. If we do call them that without permission then it’s considered rude. This because foreigners don't want people they are speaking with to think “we’re not ..