뭐

what

Explanation

1. what
A pronoun used to refer to a fact or object that one does not know of.

2. what
A pronoun used to refer to a subject that does not need to be specified or named.

3. really
A word used when the speaker is surprised at, laments, or regrets an unexpected thing or situation that happened, and emphasizes it.

Examples
방금 뭐라고 했어?
지금 옷 안에 감추고 있는 게 뭐죠?
뭐 때문에 나한테 삐쳐서 말도 안 하는 거야?

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