"이런 감정도 이름이 있을까?" UNDO : 01. YOU Sieun / UNDO [CREDITS] Executive Producer : HOUDINI, SHIN CHEOL MIN Producer : HOUDINI Composed : HOUDINI, YOU Sieun Lyric : YOU Sieun, HOUDINI Bass : HOUDINI Guitar : HOUDINI Keys : HOUDINI Synth : HOUDINI Chorus : YOU Sieun, HOUDINI Recording : HOUDINI @PS STUDIO Digital Edit : RAW, HOUDINI Mix&Master : HOUDINI Video : LEE BONG JUN