형 (hyeong) older brother is used by males to call their older brother.
오빠 (o-ppa) older brother is used by females to call their older brother.
남동생 (nam-dong-saeng) younger brother is used by both males and females.
형 (hyeong) means "older brother" when a male is speaking. Females use 오빠 (o-ppa) for the same meaning.
1. Calling your older brother (male speaker): "형! (hyeong!)" (Brother!).
2. Calling your older brother (female speaker): "오빠! (o-ppa!)" (Brother!).
3. Talking about a younger brother: Using 남동생 (nam-dong-saeng) younger brother.
Where did my older brother go?
Brother, help me!
Do you have a younger brother?
• 형 (hyeong) older brother (male speaker)
• 오빠 (o-ppa) older brother (female speaker)
• 남동생 (nam-dong-saeng) younger brother