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1 is the Japanese debut studio album by the South Korean boy band B1A4. It was released in October 24, 2012 in three different editions.

Background
The album was announced by the group's Korean agency, WM Entertainment, with details of the album release and along with a release of the group's first DVD B1A4 History 2011-2012 in Japan.

The album was released in three different editions: the CD+DVD set, the CD+Goods set, and the regular edition. The CD+DVD version included the CD and a DVD including the music videos of "Beautiful Target" and "Oyasumi Good Night", as well its making-of videos. The CD+Goods version included the CD and a special member figure (one out of five different types). The third edition, the regular edition, including the CD itself and a special trading card (one out of five different types). All editions comes with a special lottery ticket to a Premium Event of their first Japanese album.

Singles
Two songs from the album were released as singles:

The first single from the album is a Japanese version of Beautiful Target. It was released on June 27, 2012 as the group's Japanese debut single. The original version of the song, recorded in Korean, was released on the group's second Korean EP, It B1A4. It peaked number 4 on Oricon's Weekly chart with around 38,000 copies sold to date.

The second and final single from the studio album is a Japanese version of Baby Good Night, retitled in Japanese to "Oyasumi Good Night" (おやすみ good night). It was released on August 29, 2012 and peaked number 4 in Oricon's Weekly chart with around 39,000 copies sold to date. The original version of the song, recorded in Korean, was released on the special version of the group's first Korean album, Ignition.

CD+DVD Edition

 * Beautiful Target MV (Japanese Version)
 * Oyasumi Good Night MV (Japanese Version)
 * Beautiful Target Behind-the-Scenes (Japanese Version)
 * Oyasumi Good Night Behind-the-Scenes (Japanese Version)

Chart Rankings
The album "rose as high as second place on the Oricon Daily Chart. B1A4 came close to taking over the no. 1 spot currently taken up by the Japanese singer/songwriter LEO, and in Tower Records even rose to no. 1 on its Daily Sales chart."