Listen and download on iTunes https://itunes.apple.com/album/4-walls-the-4th-album/id1052057270 f(x) Official http://fx.smtown.com http://www.youtube.com/fxsmtown http://www.facebook.com/fx.smtown f(x) 에프엑스 Comeback Stage '4 Walls' KBS MUSIC BANK 2015.10.30 ℗ S.M.Entertainment
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