Once upon a time there was a font called Nanum Brush Script put out there by Google fonts... I have no idea if it still exists - but I suspect that is the font you are looking for.
Identified font: Nanum Brush Script
Edited on Oct 13, 2012 at 15:04 by drf_
My friends has it on his Mac.
Oh, OK, then my comment is irrelevant.
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