Joo returned with “Bad Guy” on Music Core 2011/01/082019/08/13 admin K-News (한국 뉴스) South Korea (대한민국) ~| Music News Joo, “Bad Guy” adlı parçasıyla bu haftaki bölümde Music Core’a dönüş yaptı. nilamman Joo returned to Music Core with title track “Bad Guy” on this week’s episode. Korea-Fans News Agency – 08.01.2011