F.T. Island (Korean: 에프티 아일랜드, Japanese: エフティー・アイランド; stylized as FTISLAND), short for Five Treasure Island, is a five-member South Korean pop-rock band. The members are Choi Jong-hoon (guitar and keyboard), Lee Hongki (lead vocals), Lee Jae jin (bass and vocals), Song Seung-hyun (guitar and vocals; replacing Oh Won-bin in 2009), 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.
F.T. Island is considered to be South Korea's first instrumental idol band.
F.T. Island is also the first Foreign Male Band to rank top in the Oricon Daily Charts which is the first band to top the charts in 42 Years.