F.T. Island (Korean: 에프티 아일랜드), Five Treasure Island, or FTI, is a famous five member South Korean band. The name F.T. Island stands for 'Five Treasure Island'. Their debut album, titled "Cheerful Sensibility", was the sixth best-selling album in 2007. Their debut song 'Lovesick' stayed on top of kpop charts for 8 consecutive weeks. Their first album in Japan also was the sixth best selling album by Oricon chart.