2007-08: Debut with Cheerful Sensibility and Japanese Debut with Prologue of F.T. Island: Soyogi

F.T. Island's first album, Cheerful Sensibility, was released on June 7, 2007. Prior to that, the members appeared on the Korean television show "Wanna be my girlfriend?" (Korean: 두근두근 여친만들기) on Mnet. The band also performed live on stage at Rolling Hall and held their first official showcase at Live House Melon-AX, Gwangjang-dong in Seoul on May 27, 2007.[8]

The album combined 13 songs that were loosely divided into two parts, "Emotional Chapter" and "F.T. Island Chapter", which was according to the genre of the songs.[9] The "Emotional Chapter" consists of rock ballads, while the "F.T. Island Chapter" was produced by Japanese composers who worked with the Japanese band SMAP, who composed a variety of pop rock songs.[10] Selling over 79,000 copies in 2007, it was the sixth best-selling album of the year.[11] The album was later re-packaged on December 3, 2007, titled, The Refreshment (Vol. 1.5) with three extra songs, a photo book, a stack of photo cards and a mixing program called Music 2.0, which allows one to adjust the levels of the instruments and vocals. The edition sold 25,724 copies in December 2007.[11]

F.T. Island in 2008

After debuting in Korea, FNC Entertainment (formerly FNC Music) moved F.T. Island's activities overseas. On March 31, 2008, an autograph session in Malaysia at the Damansara Cineleisure was held, which was followed by the group's first concert at the Sunway Lagoon Amphitheater on the next day.[12] However, the performance was canceled,[13] but was held in Thailand instead, at the Royal Paragon Hall on April 14, 2008.[14]

F.T. Island's first Japanese debut album, titled Prologue of F.T. Island: Soyogi, was later released on June 7, 2008. The album consists of eight songs, two of which were newer versions of the original songs "F.T. Island" and "Primadonna". The last track, "Always Be Mine", is an English version of "First Kiss" from their debut album (though the lyrics are original). Music videos were also released for "Soyogi" and "Friendship", displaying the band's professionalism and playful sides.

After their promotional activities in Japan, the band then returned to Korea releasing their second Korean album Colorful Sensibility on August 27, 2008. A follow-up epilogue, Colorful Sensibility Part 2, was later released on October 17.

Later that year, F.T. Island also released "The One", which was their first Japanese commercial single under an indie label AI Entertainment. The single charted at ninth on the Oricon daily charts.[15] The single was also the last official release with member Oh Won Bin before his departure.[16]