하이투힘 (Hi to him) – And So On
Track 05 from EP "Ep 2"
Release Date: 2013.06.05
하이투힘 (Hi to him) – 그저 바라만 보다가
Track 04 from EP "Ep 2"
Release Date: 2013.06.05
하이투힘 (Hi to him) – 저기 (Duet Ver.)
Track 04 from EP "EP3"
Release Date: 2017.07.24
하이투힘 (Hi to him) – 짝사랑 왈츠
Track 03 from EP "EP3"
Release Date: 2017.07.24
하이투힘 (Hi to him) – It Was U
Track 03 from EP "Ep 2"
Release Date: 2013.06.05
하이투힘 (Hi to him) – 여름은 (부제: 소나기)
Track 01 from Single "여름은"
Release Date: 2014.08.29
하이투힘 (Hi to him) – 안녕 (Hi To Him)
Track 04 from EP "EP"
Release Date: 2012.03.14
하이투힘 (Hi to him) – 순간의 감정
Track 02 from EP "EP3"
Release Date: 2017.07.24
하이투힘 (Hi to him) – 나도 모르는 사이에
Track 02 from EP "Ep 2"
Release Date: 2013.06.05
하이투힘 (Hi to him) – I’m So Sorry
Track 03 from EP "EP"
Release Date: 2012.03.14
하이투힘 (Hi to him) – 저기
Track 01 from EP "EP3"
Release Date: 2017.07.24
하이투힘 (Hi to him) – 반짝반짝 (With e_so)
Track 01 from Single "반짝반짝"
Release Date: 2018.01.16
하이투힘 (Hi to him) – 핑계
Track 01 from EP "Ep 2"
Release Date: 2013.06.05
하이투힘 (Hi to him) – 봄
Track 02 from EP "EP"
Release Date: 2012.03.14
하이투힘 (Hi to him) – 들러리
Track 04 from EP "말하지 못 한 이야기"
Release Date: 2014.08.04
하이투힘 (Hi to him) – 고백
Track 01 from EP "EP"
Release Date: 2012.03.14
하이투힘 (Hi to him) – 미치겠네
Track 03 from EP "말하지 못 한 이야기"
Release Date: 2014.08.04
하이투힘 (Hi to him) – 청춘가
Track 02 from EP "말하지 못 한 이야기"
Release Date: 2014.08.04
하이투힘 (Hi to him) – 그냥하자
Track 01 from Single "그냥하자"
Release Date: 2016.07.19
하이투힘 (Hi to him) – Winter Waltz
Track 01 from Single "Winter Waltz For Christmas"
Release Date: 2012.12.14
하이투힘 (Hi to him) – Beauty Life
Track 01 from Single "Beauty Life"
Release Date: 2018.08.22
하이투힘 (Hi to him) – 이별을 말할게
Track 01 from Single "지난 겨울"
Release Date: 2014.03.19
하이투힘 (Hi to him) – 그게 아니야
Track 01 from EP "말하지 못 한 이야기"
Release Date: 2014.08.04
서영일, 하이투힘 (Hi to him) – 철 지난 여름노래
Track 01 from Single "철 지난 여름 노래"
Release Date: 2015.10.05