4:44 (4시 44분) (feat. Wheein of MAMAMOO) ko
Do Re Mi Fa Sol (도레미파솔) (Feat. Changmo) ko
Don't Cry ko
Don’t Cry ko
Flower (꽃) (With Kim Min Seok) ko
Holding The End Of This Night (이 밤의 끝을 잡고) ko
I (아이) (Feat. Dawn) ko
I Do I Do ko
My Lover (내연인) ko
My Reflection (넌 나의 거울) ko
Remembered ko
Shameful (창피해) ko
Spring (봄) (Feat. Sandara Park) ko
The First Snow (첫눈) (With Sandara Park) ko
Wanna Go Back (되돌릴 수 없는 돌아갈 수 없는 돌아갈 곳 없는) ko
You and I ko