Is username “hackedperson” still here?

It does not violate any form of criminal law in South Korea if you answer positively to my answer above. It does not constitute any sort of libel/defamation since there is no exact name of Mr. Choi(age 24), in the article. Much less so, if you answer negatively. Maybe H person you said in your post is not this person, since in this article it was described as it was done by Choi alone and you said in your post that his friends were kicked out of the school, not H.