Island debuted on the music television program M Countdown on June 7, 2007, with the single "Love Sick".

Their debut studio album, Cheerful Sensibility, was the sixth best-selling of the year and "Love Sick" topped the K-pop charts for eight consecutive weeks.

Prior to that, the members appeared on the South Korean television show "Wanna be my girlfriend?"

On March 31, 2008, an autograph session in Malaysia at the Damansara Cineleisure was held, which was to be followed by the group's first concert at the Sunway Lagoon Amphitheater the next day.

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.

[13] On January 28, 2009, it was announced that member Oh Won Bin would be leaving the group,[14] with FNC trainee Song Seung-hyun replacing him as a guitarist and backup vocalist.

Island also toured parts of Asia which included Singapore, Japan, Thailand, Taiwan, and others to promote themselves in the summer of 2009.

On July 9, FNC Entertainment released jacket photos for the upcoming third album called Cross & Change.

On the following day, a music video teaser for "I Hope" was released online, featuring kids watching their idols (played by the members themselves) on TV.

Island released another single named "Brand-new days", which was written and composed by Seung-hyun and Jong-hoon.

[29][30] They also performed at the international rock festival Summer Sonic 2010 in Maishima Arena, Osaka, Japan.

The title song topped many popular music charts in South Korea and also gained international notice, especially in Taiwan.

Former vocalist and guitarist Oh Wonbin, appeared as a special guest and performed his first single as a solo artist and a brand new song, which had not been released at the concert.

The album features songs from their previous singles such as "Flower Rock", "Brand New Days", "So Today...", and "Satisfaction"; it also contains several new tracks, including the soundtracks for Japanese drama Muscle Girl!, in which member Hong-gi played the lead male role.

"Triple Crown" is a recognition for any artist who have won a music programme three times consecutively and the song would be removed from further trophies.

Island and fellow labelmate CNBLUE performed in North America for the first time at Los Angeles' Nokia Theater.

Island released their fourth South Korean studio album Five Treasure Box and its single "I Wish" on September 10.

[59] All three songs ended up in the top 5 of Japanese music site Dwango's K-Pop weekly ringtone chart.

[61] The group released their Japanese album Rated-FT in June 2013, where members composed tracks such as "Time To", "Hold My Hand", "Black Chocolate" and "Orange Sky".

It included two tracks composed by the members which were "Eyes On Me" and "Rainy Day" which both topped the Oricon Daily Chart.

Island returned to Korea in late September 2013, and released their self-composed mini-album Thanks To, dedicated to their fans and supporters.

"[72] Their Japanese Zepp Tour started on October 1, 2013, in Tokyo, and later performed in Sapporo, Osaka, Fukuoka, Shizuoka and Nagoya, as well.

[73] The band made their official South Korean comeback with their fifth mini album The Mood on November 18, 2013.

Island also held several tours and announced partnership with Taiwanese clothing brand, STAYREAL.

The title song of the album, "Primavera" is a collaboration with Japanese rock singer Takahiro Moriuchi.

[108] "Puppy", a Japanese single, was released three months later and reached sixth position in Billboard's Japan Hot 100.

[116] The song also came atop in Tower Records Japan for the top 10 K-pop singles and albums for the second week of September.

[117] On March 14, 2019, Jong-hoon left the band and retired from the entertainment industry after being involved in the Burning Sun scandal, where he was part of a group chat in which some members shared videos of sexual activities recorded without the consent of the other party.

Some of the reasons behind this lineup were to showcase more of the members' skills and to prevent main singer, Lee Hong-gi, from overstraining his voice again.