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은 누구야

who is

→ 은
phrase Rare #23,922
who is An informal way to ask who someone is. 은 marks the person or topic being asked about, and 야 is the informal form of 이다. Depending on the wording and tone, this can sound blunt or rude.
KO: 저 사람은 누구야?
EN: Who is that person?

저 년은 누구 야?

Who is that girl?

— 빅토리아 (2015)

저 원시인은 누구 야?

Who is that caveman?

— 행복한 라짜로 (2018)

파야칸은 누구 야?

Who is Payakan?

— 아바타: 물의 길 (2022)