says who?
US /ˈsɛz huː/
UK /ˈsɛz huː/

1.
누가 그래?, 누가 말했어?
used to express doubt or disagreement with a statement, implying that the source of the information is questionable or lacks authority
:
•
You can't do that. Says who?
그렇게 할 수 없어. 누가 그래?
•
They told me I'm not allowed to enter. Says who?
그들은 내가 들어갈 수 없다고 했어. 누가 그래?