" "show surprise at something" is normal English. As for why, I don't know. It's just what people say.
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park sang joonI'd like to know why it is "at," not "over.""show surprise at something" is normal English. As for why, I don't know. It's just what people say.
park sang joonAnd I'd like to know "to himself" is implied after "said."It would have to be "to myself".