Are you kidding me? (Literally 'is it [you] joking?')
진심이에요?
Are you serious? (진심 = 'true heart'.)
왜 그렇게 심각해요?
Why so serious? (그렇게 = 'like that, so'.)
생각 좀 해볼게요
Let me think (Literally 'let me try doing some thinking'.)
믿을 수 없어요
I can't believe it (-을 수 없다 = 'cannot' pattern.)
아이고, 진짜!
For God's sake! / Geez! (아이고 — all-purpose exclamation of dismay.)
아쉽네요
What a pity (아쉽다 = 'feel a lingering regret/wish for more'.)
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