No actually. Almost all voices of Dota 2 are perfectly done and fit the hero. And why would you want Korean wtf?
here are some korean casters to go with it
http://www.youtube.com/watch?feature=player_embedded&v=5G9O9j0DSII
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Well was watching Arteesy steam on twitch.tv and his dota was korean. So I asked how he did it. Someone told me thanks to them I got it working, here's how u can override to TRYHARD american voice actors and listen or Chinese or Korean ones for a change.
http://www.neutralcreeps.com/2013/07/how-to-play-dota-2-in-korean.html