WOOYOUNG of 2PM celebrates the 10th anniversary of his Japan solo debut with his first best album. It features 18 of his representative songs (common to all editions), including a highly anticipated new track (subject to change). The Limited Production Pi Young Edition features a Pi Young-design jacket and a Pi Young-design picture label. It comes with a 24-page lyric booklet and a cheki-style photo card (Pi Young Edition ver.) randomly selected from 3 kinds.