Park Jae-Sang (Hangul: 박재상; born December 31, 1977) is a South Korean rapper. He is mainly known by his stage name, Psy (Hangul: 싸이). His 2012 single "Gangnam Style" was a surprise viral hit. Before its popularity he was little known outside South Korea. Psy performed "Gangnam Style" on the American show Saturday Night Live.