I don't even think a ban on SC2SEA tournaments is the best option, given that it's obvious hyun was a bit clueless about the whole affair.
Should get Jaz or someone with conversational Korean to put together like a training video, have a korean professional walk through a build for everyone and upload it solely for SC2SEA. (Then link on reddit for maximum karma.)
Of course, banning him's easier, but yeah, the intent on hyun's part was not malicious whatsoever, and the punishment should reflect that.
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