| Piano, Keyboard | Al『第1集 처음처럼』(2001.04 DK-0131) |
| 슬픔이 슬픔을 | Piano | Al『第2集 MELODIE d' AMOUR』(2002.07 DRMCD-1875) |
| Keyboard, Chorus, Computer Programmer | Al『第3集 DOUBLE LIFE; THE OTHER SIDE』(2003.10 YWRCD-082) |
| Keyboard, Computer Programmer | Al『Remake Album 제수도의 푸른밤』(2004.05 SRCD-3760) |
| 안녕 | Piano | Al『第4集 다시 꿈꾸고 싶다』(2005.04 YWRCD-109)
Al『季節が戻ってくるように～The Best of SUNG SI KYUNG』(2006.11.22 BVCM-31207) |
| 일학년 일반 | Piano, Chorus | Al『第4集 다시 꿈꾸고 싶다』(2005.04 YWRCD-109) |
| Piano & Keyboard, Chorus, Computer Programming | Al『第5集 THE BALLADS』(2006.10 SRCD-3913) |