- 2009 [digital single] I Want You Back
- 2009 [Jieun digital single] Yesterday
- 2010 [1st mini] Magic
- 2010 [2nd mini] Madonna
- 2011 [1st single] Shy Boy
- 2011 [Jieun digital single] Going Crazy
- 2011 [2nd single] 별빛달빛
- 2011 [日本 1st single] Madonna
- 2011 [1st full] Moving in Secret
- 2011 [日本 1st mini] Shy Boy
- 2012 [日本 2nd single] これくらいのサヨナラ
- 2012 [日本 3rd single] TWINKLE TWINKLE
- 2012 [日本 1st full] WELCOME to SECRET TIME
- 2012 [3rd mini] Poison
- 2012 [Sunhwa digital single] Everything Is Pretty
- 2013 [digital single] TALK THAT
- 2013 [4th mini] Letter From Secret
- 2013 [Jieun 1st single] False Hope
- 2013 [3rd single] Gift From Secret
- 2014 [日本 4th single] I Do I Do
- 2014 [Hyoseong 1st single] Top Secret
- 2014 [日本 5th single] YooHoo
- 2014 [5th mini] Secret Summer
- 2014 [Jieun digital single] Don’t Look At Me Like That
- 2014 [Jieun 1st mini] 25
- 2014 [Jieun 1st mini日本盤] 25
- 2015 [Hyoseong 1st mini] Fantasia
- 2015 [Jieun digital single] Cool Night
- 2016 [Hyoseong 2nd mini] Colored
- 2016 [Jieun 2nd mini] Bobby Doll
- 2020 [Jieun single] 피어나：開花