Kim Sang Woo (김상우), better known as Roy Kim (로이킴) is a male South Korean singer and the winner of SuperstarK4. After the final, Roy Kim has announced that he will be donating his prize money ($460,596) to charity. He already made his debut at ‘2012 MAMA‘ with a special stage, and his other prize is a support for the release of his new album, as well as a brand new car. He finally debuted on April 22, 2013 with the digital single "Bom Bom Bom / Spring Spring Spring".