So – 꿈은 (Vocal View)
Track 01 from Single "꿈은"
Release Date: 2017.05.02
So – Say Love Me (Vocal Hyangs)
Track 01 from Single "Start"
Release Date: 2017.01.17
So – 진심 (Feat. 찬 of A.C.E)
Track 01 from Single "진심"
Release Date: 2019.04.02
So – 안녕, 크리스마스! (with 김새봄)
Track 01 from Single "안녕, 크리스마스!"
Release Date: 2019.12.23