When a Korean adult says that a kid is nice (착하다), it means that he/she does not seem to be particularly intelligent. "Though he is not smart," is usually implied in the sentence, "he is nice." I am proud to say that I have never been called a nice kid.
As I write, I am thoroughly enjoying dried persimmon (곶감), even though I know that it is a product of P.R.O.C. (중국산!). I think the Korean market may have intentionally labeled it "Product of P.R.O.C." so that nice kids and adults alike do not realize it is made in China.
