Debut single in Japan release from IU featuring her hit song in Korea "Good Day (Japanese ver.)." This edition includes a photo booklet and a bonus DVD with "IU JAPAN PREMIUM SPECIAL LIVE" held at Shibuya Orchard Hall on January 24, 2012 in which she performed five songs "Lost Child," "Rain Drop," "Good Day (Japanese ver.)," "Last Fantasy," and more (30 min.) plus documentary movie in Japan (all subject to change). *The DVD disc is encoded for region 2 (Japan, Europe, and Middle East), and no subtitles are included.