The Korean family title matrix
Textbook가족이 아닌 사람에게도 사용합니다ga-jok-i a-nin sa-ram-e-ge-do sa-yong-hap-ni-daUsed for non-family members too
Real편의점 언니, 치킨집 사장님 오빠pyeon-ui-jeom eon-ni, chi-kin-jip sa-jang-nim o-ppaConvenience store unni, chicken shop oppa🏷️ Daily conversation
These aren't just family words — Koreans use them for ANYONE older. Your older friend, your boyfriend (오빠), your work 선배, even random shop staff. Not using them when you should is a social faux pas.
When 오빠/언니 gets complicated
남자친구를 오빠라고 부르기Calling your boyfriend 오빠 (standard for many Korean couples)
여자가 형이라고 하면?If a girl says 형? = she's being tomboyish/funny
남자가 언니라고 하면?If a guy says 언니? = he's being cute/gay culture
동생이라 부르는 거 싫어하는 사람Some people hate being called 동생 (feels infantilizing)
The title you choose signals your entire relationship dynamic. Calling someone 오빠 vs. their name vs. their job title = three completely different relationships. Koreans obsess over this.
Foreigner tip: when in doubt, ask '뭐라고 부르면 돼요?' (what should I call you?). Koreans love this question because it shows you understand the system. They'll usually say their preference. It's the most socially intelligent Korean sentence you can say.
Quick Quiz