They originally debuted as a 7 member group; however, after the release of their second digital single, three members left. In December 2011 it was announced that they would debut in Japan in April under Tokuma Japan as a five member group including new member Shine. Member Boreum did not promote with the group since August 2012, which made fans assume she had left the group.
In October 2013, in a recent tweet made by their choreographer, he said the group disbanded.
- Official Fanclub: Shy Girl(s)
- [2011.03.18] Jangnanchijima (장난치지마; Don't Play Around)
- [2011.07.21] Longer
- [2012.06.29] Love Is Energy
- [2012.08.17] Ma Boy OST (마보이)
- [2012.04.25] Karakawanaide!! (からかわないで!!)
- [2011.12.05] Seoul Success Awards: Best Newcomer