F.T. Island (Korean: 에프티 아일랜드 Japanese: エフティー・アイランド; stylized as FTISLAND), short for Five Treasured Island, is a five-member South Korean band. The members are Choi Jong Hun (guitar and keyboard), Lee Hongki (lead vocals) Lee Jae Jin (bass and vocals), Song Seung Hyun (guitar and vocals), and Choi Min Hwan (drums). Their debut album, titled "Cheerful Sensibility", was the sixth best-selling album in 2007. Their debut song "Lovesick" topped the K-Pop charts for eight consecutive weeks. Oh Won Bin was a member of the band until the beginning of 2009.
source : wikipedia