누나가

older sister

→ 누나
phrase Uncommon #10,333
older sister 누나 means “older sister” when spoken by a male. 가 is the subject particle, so 누나가 marks “older sister” as the subject of the sentence.
KO: 누나가 오늘 집에 와요.
EN: My older sister is coming home today.

, 누나가 그렇죠

Well, that’s just how you are, sis.

— 굿바이, 레닌 (2003)

누나가 옳았어

You were right.

— 걸리 보이 (2019)

나 에게는 누나가 있다.

I have an older sister.

누나가 도와줄게

This older sister will help you

— 물랑루즈 (2001)