Older brother — said only by a woman, and often to a boyfriend.
Korean has four different words for sibling depending on who is speaking. A woman calls an older male 오빠; a man calls an older male 형 (hyung). It extends well past family to older male friends, and calling a boyfriend 오빠 is completely standard — which is why it carries a flirty charge in K-drama.
A man must never call another man 오빠 — that is 형. Getting the sibling words wrong is the single most common mistake learners make in Korean.
Reading a definition isn't the same as saying it to someone. Lingo Kaiava is a voice tutor set to Korean — it uses 오빠 the way locals do, corrects you in the moment, and never "fixes" the way real people actually talk into textbook Korean.
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