가인, 조형우 – 2시의 데이트
Track 02 from EP "Romantic Spring"
Release Date: 2013.04.08
가인, 조권 – 우리 사랑하게 됐어요.
Track 01 from Single "우리 사랑하게 됐어요"
Release Date: 2009.12.17
가인 – 열두 시가 되면
Track 02 from Single "열두 시가 되면"
Release Date: 2015.12.22
가인 – Must Have Love (Feat. 에릭남)
Track 01 from Single "열두 시가 되면"
Release Date: 2015.12.22
가인 – 비밀
Track 04 from EP "End Again"
Release Date: 2016.09.09
가인 – 노스텔지아 (Feat. 에릭)
Track 01 from Single "노스텔지아"
Release Date: 2012.11.30
가인 – Set Me Free
Track 01 from Single "VIP OST Part.2"
Release Date: 2019.11.18
가인 – 반딧불이의 숲
Track 03 from EP "End Again"
Release Date: 2016.09.09
가인 – Carnival (The Last Day)
Track 02 from EP "End Again"
Release Date: 2016.09.09
가인 – Carrie (The First Day)
Track 01 from EP "End Again"
Release Date: 2016.09.09
가인, 민서 – 임이 오는 소리
Track 01 from Single "임이 오는 소리"
Release Date: 2016.06.03
가인, Jeff Bernat – Pray
Track 01 from Single "Pray"
Release Date: 2017.01.22
조pd (ZoPD), 가인 – Free Music
Track 02 from Single "HOLD THE LINE"
Release Date: 2006.05.30
가인 – Kiss or Kill
Track 02 from Album "미씽나인 OST"
Release Date: 2017.03.13
가인 – I Believe
Track 03 from Album "내 생애 봄날 OST"
Release Date: 2014.11.04