뭘 하는 거죠

what are you doing?

→ 뭐+를
phrase Rare #22,811
what are you doing? A polite question asking what someone is doing; the subject can change depending on context, so it can also mean “what are they doing?” The ending 거죠 adds a tone of seeking confirmation or expressing confusion or surprise.
KO: 지금 여기서 뭘 하는 거죠?
EN: What are you doing here right now?

그래 뭘 하는 거 죠?

So, what are you doing?

— 필사의 추적 (1981)

네, 내가 뭘 하는 거 죠?

Yes, what am I doing?

— 영원 (2025)

미셸 뭘 하는 거 죠?

What is Michelle doing?

— 블랙 (2005)

뭘 하는 거 죠?

What are you doing?

— 필사의 추적 (1981)