Gil Seong-joon (Korean: 길성준, Hanja: 吉成俊; born December 24, 1977), better known by his stage name Gil (Korean: 길) is a South Korean singer and television personality. He is co-founder of Leessang. He has been a member of MBC's Infinite Challenge since April 2009.In 2009, Gil joined Infinity Challenge as a guest and, later on, as a regular co-host. Gil also co-hosted Come To Play.In 2012, Gil joined Voice of Korea as one of the coaches.