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Kang Yoon-sung (born November 16, 1983), is a South Korean singer under contract in Japan. He was born in Goyang. In 2004, after achieving little success with his first album in South Korea, Kang crossed over to Japan. His first Japanese album, Beyond the Sea, has achieved a sales of over 300,000 copies. Kang put his musical activities on hold in 2010 so he could complete the Korean mandatory military service.