Alex

- Like a Child (feat. 알렉스)
- Monologue · 2008
- Solo (feat. Alex)
- Last Days · 2008
- 화분 (알렉스 Version)
- 화분 - Single · 1993
- EYES (feat. Alex)
- KC2.5 · 2025
- Give you my love
- My Lovely Girl (Original Television Soundtrack) · 2014
- 너에게로 날다 (With. 박화요비, 별, 알렉스, 대니정) [feat. Park Hwayobi, Star, Alex & Danny Jung]
- Para Ti (Repackage) · 2007
- Show! (feat. Alex & Tablo)
- 정인 From Andromeda - EP · 2010
- Love Me After 12AM
- Cosmicolor · 2007
- Dance With My Daddy
- 202 Pounds Beauty (Original Soundtrack) · 2006
- Night Time
- Que sera sera · 2007
- 연애세포
- 썸남썸녀 OST Part 2. - EP · 2015
- If I could Turn it Back (feat. Jane)
- Just Like Me · 2011
- 화이트데이 (Instrumental Version)
- 화이트데이 - Single · 2019

화이트데이 - Single

화이트데이 - Single

2019
I am the mother too (Original Soundtrack) Part.3 - EP

I am the mother too (Original Soundtrack) Part.3 - EP

2018
I am the mother too (Original Soundtrack) Part.2 - Single

I am the mother too (Original Soundtrack) Part.2 - Single

2018
Sing For You- 3rd Story -Don't Worry, My Dear - Single

Sing For You- 3rd Story -Don't Worry, My Dear - Single

2017
Bubble Gum, Pt. 2 (Original Television Soundtrack) - Single

Bubble Gum, Pt. 2 (Original Television Soundtrack) - Single

2015
썸남썸녀 OST Part 2. - EP

썸남썸녀 OST Part 2. - EP

2015
My Lovely Girl (Original Television Soundtrack), Pt. 3 - EP

My Lovely Girl (Original Television Soundtrack), Pt. 3 - EP

2014