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PocketTunes - hands down! Its not free, $6.99, but worth it, to me anyway.
Well I know it has all of the BBC stations. Is there a particular country or countries your are interested in and I can check for you?
I use an app called clock radio which lists a number of Korean stations under it's international/Asian setting.
Basically it's digital clock display with streamed radio. Not the prettiest but it works well