20 [Twenty] (stylized as 20 [twenty]) is the third studio album released in Japan by South Korean rock band F.T. Island. It is their second studio album under Warner Music Japan and third studio album overall in the country. Recorded in South Korea in the midst of the band's promotions there, the band aimed to make 20 [Twenty] their most mature album to date. The album spawned three singles prior to its release—"Let It Go!", "Distance", and "Neverland"—which all charted within the top ten spots of the weekly Oricon singles chart.

20 [Twenty] was released on May 16, 2012, in three editions: a CD-only edition, a CD and DVD edition, and a Lawson edition. In order to promote the album, the band held two release events shortly after the album's release. The album debuted at number four on the weekly Oricon albums chart and the Billboard Japan Top Albums. Selling over 41,000 copies in its first week, 20 [Twenty] earned F.T. Island their best first-week album sales in Japan. From June to July, they embarked on their F.T. Island Summer Tour 2012: Run! Run! Run! and performed in various venues across Japan.

After performing at the Nippon Budokan in 2011, F.T. Island recorded the song "Let It Go!" in commemoration of the event. Recorded during the same period, "Neverland" was composed by Choi Jong Hoon. Described as an energetic song, he recorded the guitar as the final bit to make the instrument the most prominent in the recording. He penned the song "Stay", which is based on his personal relationship experiences. He initially wrote the lyrics in Korean, then translated them into Japanese, using a translator where he was unable to translate the lyrics by himself. The process between three and four hours.

Choi Min Hwan and Song Seung Hyun worked on the songs "Always" and "Compass" together while in high school. Discussing "Always", Choi Min Hwan compared the song to "Satisfaction" in that one may feel a similar "atmosphere and a strength", but noted that there was more emphasis of sorrow in "Always". "Paper Plane" is a medium-tempo song, which features a dense snare drum. "Distance" was written by Kenn Kato, Song Seung Hyun and Lee Jae Jin, and composed by Corin. Lead singer Lee Hongki had difficulty singing the song, stating that the key he sang in was very high.

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