서인국 – Prime Time (Feat. 리사)
Track 05 from EP "Just Beginning"
Release Date: 2010.05.06
서인국 – 왜 웃기만해
Track 04 from EP "Just Beginning"
Release Date: 2010.05.06
서인국 – 마지막 생일
Track 03 from EP "Just Beginning"
Release Date: 2010.05.06
서인국, Take#1 – Love Again
Track 01 from Single "Take#1 - Vol.3"
Release Date: 2011.12.14
서인국 – 사랑해 U
Track 02 from EP "Just Beginning"
Release Date: 2010.05.06
서인국 – 아름다운 이별
Track 03 from Single "부른다"
Release Date: 2009.10.27
서인국 – Young Love
Track 01 from Single "부른다"
Release Date: 2009.10.27
서인국 – 사랑해 U (Lovely Ver.)
Track 08 from Album "애기야"
Release Date: 2010.08.10
서인국 – 첫눈에 (Feat. 베카 Of 애프터스쿨)
Track 07 from Album "애기야"
Release Date: 2010.08.10
서인국 – 너 땜에 못살아 (Feat. 버벌진트)
Track 04 from EP "웃다 울다"
Release Date: 2013.04.11
서인국 – 행복했을까 (Feat. 구혜선)
Track 02 from EP "웃다 울다"
Release Date: 2013.04.11
서인국 – Prime Time (Feat. Lisa)
Track 06 from Album "애기야"
Release Date: 2010.08.10
서인국 – 웃다 울다
Track 01 from EP "웃다 울다"
Release Date: 2013.04.11
서인국 – 왜 웃기만해
Track 05 from Album "애기야"
Release Date: 2010.08.10
서인국 – 마지막 생일
Track 04 from Album "애기야"
Release Date: 2010.08.10
서인국 – 애기야 (My Baby U)
Track 03 from Album "애기야"
Release Date: 2010.08.10
서인국 – Mint Chocolate (Feat. 40)
Track 02 from Single "함께 걸어"
Release Date: 2017.03.27
서인국 – 사랑해 U
Track 02 from Album "애기야"
Release Date: 2010.08.10
서인국 – 함께 걸어
Track 01 from Single "함께 걸어"
Release Date: 2017.03.27
서인국 – 아름다운 이별
Track 11 from Album "LOVE"
Release Date: 2009.12.18
성시경, 브라이언, 서인국, 박학기, 박장현 (VROMANCE), 황 프로젝트 – 모두에게 크리스마스
Track 01 from Single "Jelly Christmas 2011"
Release Date: 2011.12.02
성시경, 박효신, 서인국, VIXX (빅스), 여동생 – 겨울 고백
Track 01 from Single "Jelly Christmas 2013"
Release Date: 2013.12.10
성시경, 박효신, 이석훈, 서인국, VIXX (빅스) – 크리스마스니까
Track 01 from Single "Jelly Christmas 2012 HEART PROJECT"
Release Date: 2012.12.06
서인국, VIXX (빅스), 박정아, 박윤하 – 사랑난로
Track 01 from Single "Jelly Christmas 2015 - 4랑"
Release Date: 2015.12.15
서인국 – Fate (Like A Fool) (From “Love Rain” Soundtrack)
Track 04 from Album "Love Rain (Original Soundtrack Part.2)"
Release Date: 2012.05.29
서인국, 지아 – 이별남녀
Track 01 from Single "이별남녀"
Release Date: 2013.12.02
성시경, 박효신, 서인국, 브라이언, 리사, 박학기, 김형중, 견우 (Kyunwoo) – Christmas Time
Track 01 from Single "Jelly Christmas"
Release Date: 2010.12.06
서인국 – 꽃
Track 01 from Album "내일 그대와 OST"
Release Date: 2017.03.24
서인국, VIXX (빅스), 구구단 (gugudan), 박윤하, 박정아, 김규선, 김예원, 지율 – 니가 내려와
Track 01 from Single "Jelly Box Jelly Christmas 2016"
Release Date: 2016.12.13