In 2010, there was a group called CO-ED SCHOOL, which was the only co-ed kpop group at the time. They debuted with a few tracks, until they decided to make male and female subunits. Thus, 5DOLLS and SPEED were created.
The original 5DOLLS consisted of the four original females of CO-ED SCHOOL, Lee Soo-mi, Heo Chan-mi, Ryu Hyo Young and Jin Hye-won, and the addition of a new member Seo Eun-kyo. In 2011, they released two promotional tracks, ‘입술자국 (Lip Stains)’ and ‘너 말이야 (Your Words)’. As they are under MBK Entertainment (formerly known as Core Contents Media), they did release heavily story-plot-based music videos, following their labelmates, T-ARA.
Unfortunately, due to lesser popularity, 5DOLLS did not receive the attention needed to reach stardom. After promoting their last song as 5DOLLS, ‘Like This or That’, a long haitus, member changes, and a new name, F-VE DOLLS was created.
On March 2015, MBK Entertainment announced the disbandment of F-VE DOLLS (formerly 5DOLLS).
H.A.M (Heart And Mind) was a 4-member girl group that debuted in 2009, with their debut song, ‘T.T Dance’. As cringe-worthy the title may be, the song reflect many of the Korean old-school beats with a rough edge to it, making it a very catchy and favorable song to listeners. Eventually, due to lack of popularity and promotions, the members separated their ways.
P.S: The “T.T” depicts a emoticon representing sadness or sorrow.