B1A4 sings "SOLO DAY" in Japanese. The song is written and composed by Jinyoung. This edition includes a bonus DVD with excerpts from all the three episodes of a special live broadcasting program in Niko Niko Douga. Comes with an event ticket B (valid only in Japan). *The DVD disc is encoded for region 2 (Japan, Europe, and Middle East), and no subtitles are included.