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남동생이

younger brother

→ 남동생
phrase Rare #24,356
younger brother 남동생 means “younger brother,” and 이 is the subject particle, marking the younger brother as the subject of the sentence.
KO: 남동생이 숙제를 하고 있어요.
EN: My younger brother is doing his homework.

기타, 남동생이 생길 거 야

And I'll have a younger brother.

— 당갈 (2016)

남동생이 나갔다.

My younger brother went out.

남동생이 있어?

Do you have a younger brother?

— 크리에이터 (2023)