박재정 (Park Jae Jung) paid a visit to Sound K. <br />Check out the live performances of his song '시력 (Focus)'. <br />Only on this video. <br /> <br /> <br />Visit to Arirang Radio's Home Page to meet more K-Pop Stars! <br />http://www.arirang.co.kr/Radio/Radio_Index.asp?sys_lang=Eng