| 잘 지내죠 My Love | BACKGROUND VOCAL | Al『約束』(2004.12.01 AICL-1596) |
| 그때까지 안녕 (その日までさよなら) | BACKGROUND VOCAL | Al『約束』(2004.12.01 AICL-1596) |
| 약속 (約束) | BACKGROUND VOCAL | Al『約束』(2004.12.01 AICL-1596) |
| 慟哭 | SYNTHESIZER, ACOUSTIC GUITAR, ELECTRIC GUITAR | Al『約束』(2004.12.01 AICL-1596) |
| 내 세상이 (僕の世界が…) | Background Vocals | Al『秋桜』(2005.10.05 TKCA-72915) |
| 데자뷰 | Manipulator, Background Vocals | Al『秋桜』(2005.10.05 TKCA-72915) |
| MANIPULATOR | Al『Asian Blow』(2006.05.10 TKCA-73018) |
| 선물 (プレゼント) | BACKGROUND VOCALS | Al『Asian Blow』(2006.05.10 TKCA-73018) |
| 머리칼 (永遠の証) | BACKGROUND VOCALS | Al『Asian Blow』(2006.05.10 TKCA-73018) |