Date Track Title(s) 2009.08.26 Can't Cry (울면 안돼) Non-Album Single 2010.10.29 Two Women (두 여자) Love, In Between (두 여자) OST 2011.02.25 Heart Is Empty (가슴이 뻥 뚫려) Digital Single 2011.03.30 Lucky Single 2012.01.03 I Love You (사랑한다) Lights and Shadows (빛과 그림자) OST Part 2 2012.03.30 Stay Crying (울고도 남아서) Dummy Mommy (바보엄마) OST Part 1[11] 2012.10.30 The Teardrops Are Falling (떨어진다 눈물이) Missing You (보고싶다) OST Part 1[12] 2013.07.18 Dear Love (사랑아) The Blade and Petal (칼과 꽃) OST Part 1 2013.11.19 Love Wind (사랑 바람) Empress Ki (기황후) OST Part 2 2014.01.09 Coin Laundry (사랑한 적도 없는) Non-Album Single 2015.10.08 Not My Mind (내 맘 같지 않아) Non-Album Single 2015.11.20 Wind Watch (바람시계) (feat. BtoB's Ilhoon) Digital Single Vol.2 2016.01.24 Tears I Just Cry (그냥 눈물이 나) My Mom (엄마) OST Part 4 2016.07.13 Just One Shot (딱 한잔만) Non-Album Single (with SSJ (서사장)) 2016.11.01 You Are You Are You Are (너를 너를 너를) Non-Album Single 2019.06.16 It's Cold Like Winter (겨울인 듯 추워) Non-Album Single