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- extreme disruptive user and bad slander on several outdoor sites.
- his complaint: Meta:Steward requests/Permissions#아흔@ko.wikibooks
- outdoor slander after block (, 1 on ko WP, 2 on ko WP)
- abusing extreme multiple account (Uniquer, Unypoly(see: his socks at least, Mangnani ...). He is so cunning, that he creats account several places (internet cafe or public locations etc.) to remain undiscovered by checking user.
- disruptive activities on wikiprojects: ko wikipedia(in sock), ko wikisource,