Sunwoo Jung-A (Korean: 선우정아, born 11 May, 1985) is a South Korean singer-songwriter. In 2006 she released her debut album "Masstige" and in addition to that began her career as a producer with some of the biggest k-pop artists like GD&TOP ("Oh Yeah"), 2NE1 ("I Don’t Care", "It Hurts"), Lee Hi ("Crush", "Because", "I'm Weird"), IU ("Jam Jam"), and more.