Sung was born in Daegu. he was studying Daegu high school and Yeungnam University. In his early years, he was a business man. after 2000 to November 2006, he was Operate Thomas MacFly consulting & headhunting company(토마스 맥플라이 컨설팅 & 헤드헌팅), in Daegu and Busan, Seoul.