Seo In Guk

- All for You
- Reply 1997 - Love Story, Pt. 1 (Original Television Soundtrack) - Single · 2012
- No Matter What
- Master's Sun (Original Television Soundtrack), Pt. 7 · 2013
- Distant Fate
- Doom at Your Service (Original Television Soundtrack), Pt. 7 - Single · 2021
- 꽃
- 내일 그대와 (Original Television Soundtrack), Pt. 1 - Single · 2017
- 부른다
- 부른다 - EP · 2009
- Seasons of the Heart
- Seasons of the Heart - Single · 2016
- All for You (Instrumental)
- Reply 1997 - Love Story, Pt. 1 (Original Television Soundtrack) - Single · 2012
- Loved You
- Loved you - Single · 2013
- With Laughter or with Tears
- With Laughter or with Tears - EP · 2013
- Winter Propose
- Jelly Christmas 2013 - Single · 2013