What's eating you?
무슨 고민있니?

CONVERSATION
A: Cheer up! You haven't said a word all morning. What's eating you?
B: Nothing, I just have a sore throat.
A: Oh, I thought you were angry about something.

A : 힘 좀 내! 아침 내내 말 한마디 없잖아. 무슨 고민 있니?
B : 없어. 목이 부어서 그래.
A : 그래, 난 화난 줄 알았지.
 
VOCABULARY
cheer up : 힘내!, 기운 차려!
sore : 아픈, 쓰린