In January 2011, Park was the lyricist/composer in JYJ's music essay called Their Rooms "Our Story" for the song "이름없는 노래 Part 1 (A Song Without A Name, Part 1)".
Pada bulan Januari 2011, Micky adalah penulis lirik / komposer dalam esai musik JYJ disebut Play Their Rooms "Our Story" untuk lagu "이름 없는 노래 Part 1 (A Song Without A Name, part 1)".