On September 10, 2012, it was announced that the group would release a best of album in Japan consisting of all of their Korean singles to date (excluding "Day by Day" and "Sexy Love") in celebration of one year since their Japanese debut.
Pada tanggal 10 September 2012, diumumkan bahwa grup akan merilis album berisikan lagu-lagu terbaik mereka di Jepang yang terdiri dari semua single hits Korea mereka sampai saat ini (tidak termasuk "Day by Day" dan "Sexy Love") dalam perayaan satu tahun setelah debut mereka di Jepang.