REI (김종서, Zack Kim): Korean singer. * Thanks Korean Singer, Thanks for visit my channel - http://www.youtube.com/MVKorea REI (김종서, Zack Kim): Korean singer. Zack Kim Yong Woon (born May 5, 1983), or simply, Zack Kim is a Korean guitarist who has become known for his mastery of technique called "free hands", which involves tapping the guitar strings with both the left and right hands simultaneously. Many guitarists apply free hands to one guitar, but Zack frequently performs on two; his left hand playing one guitar while his right hand plays the other, which is like playing the piano on the guitar but with added difficulty of fretting the correct notes. His arrangements include a range of styles, from classical to jazz, as well as quirky arrangements of tunes such as the theme song from the Super Mario Bros. video game. Zack is currently serving in the Korean Army. While serving in the military, he was on a talent show in South Korea, Star King, with his free hands skill. Source: http://en.wikipedia.org/wiki/Zack_Kim