Soul String - Remember
Soul String - 오빠야 (oppaya) (With Hyunhee Seen)
Soul String - 보통의 행복 (Ordinary Happiness) (Bonus Track)
Soul String - Doubt
Soul String - 사랑하는, 사랑했던 (Loving, Loved) (With Lee Jung Kwon)
Soul String - Summer
Soul String - 춘래불사춘 (Spring Is Not Like Spring) (With YEGNY)
Soul String - 모두 어디로 갔을까? (Where did everyone go?)
Soul String - The Rainy Day
Soul String - 채움 (Fill in) (With nov)