F.T. Island (, 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 formed by FNC Entertainment in 2007. The band consists of Choi Jong-hoon (leader, guitar, and keyboard), Lee Hong-gi (main vocals), Lee Jae-jin (bass and vocals), Song Seung-hyun (guitar, vocals and rap) replacing Oh Won-bin in 2009, and Choi Min-hwan (drums). On the other hand, F.T. Triple (A3), a sub-group of F.T. Island consisted of Jong-hoon, Jae-jin and Min-hwan, and has been inactive since 2012. F.T. Triple has released singles and sang soundtracks for dramas such as Master of Study.