Learn Korean: 도대체 + WH
Let’s take a look at the Korean sentence pattern 도대체 + WH. Adding 도대체 to a question gives it a strong nuance similar to what on earth or why the hell. It is not exactly a curse but an emphasis to express surprise, shock, anger, etc.
넌 도대체 누구야?
Who the hell are you?
도대체 왜 이래?
Why the hell are you being like this?
도대체 뭐 하고 있어?
What the hell are you doing?