Alex

- Flowerpot (Bonus Track)
- My Vintage Romance · 2004
- 이별, 만남... 그 중점에서 (feat. Alex)
- Swan Songs · 2005
- If You
- My Vintage Romance · 2008
- 같은 꿈
- 같은 꿈 - Single · 2011
- I Love You (feat. Alex)
- 각인 - Single · 2006
- 만추 (Original Motion Picture Soundtrack) - 되돌릴 수 있다면 [feat. Jane]
- 만추 (Original Motion Picture Soundtrack) - 되돌릴 수 있다면 [feat. Jane] - Single · 2011
- Feel Like Making Sunshine
- My Vintage Romance · 2004
- Kissing Me! (feat. 엄정화)
- Mr.로빈 꼬시기 (Original Soundtrack) · 2006
- Woman with a Suitcase (Original Television Soundtrack) Pt. 1 - 작은 쉼표
- Woman with a Suitcase (Original Television Soundtrack) Pt. 1 - 작은 쉼표 - Single · 2016
- You're So Gorgeous
- You're So Gorgeous - Single · 2011
- 웃으며 안녕 (Pink Hoon Mix Version)
- 웃으며 안녕 - Single · 2011
- 웃으며 안녕 (Brass Version)
- 웃으며 안녕 - Single · 2011
- I can’t live without you (Instrumental)
- 3 Suspicious Brothers (Original Soundtrack) - Single · 2010

Woman with a Suitcase (Original Television Soundtrack) Pt. 1 - 작은 쉼표 - Single

Woman with a Suitcase (Original Television Soundtrack) Pt. 1 - 작은 쉼표 - Single

2016
You're So Gorgeous - Single

You're So Gorgeous - Single

2011
웃으며 안녕 - Single

웃으며 안녕 - Single

2011
같은 꿈 - Single

같은 꿈 - Single

2011
만추 (Original Motion Picture Soundtrack) - 되돌릴 수 있다면 [feat. Jane] - Single

만추 (Original Motion Picture Soundtrack) - 되돌릴 수 있다면 [feat. Jane] - Single

2011
3 Suspicious Brothers (Original Soundtrack) - Single

3 Suspicious Brothers (Original Soundtrack) - Single

2010
각인 - Single

각인 - Single

2006