The girl group formation might not be a surprise, because Yuna Kim is featuring in Jeon Min Ju's upcoming single. Yuna Kim is from 'Superstar K3' and Jeon Min Ju is from 'K-Pop Star 2', and both girls already have or will have solo projects out as Jeon Min Ju, called 'Little BoA', has recently released a teaser for her debut song "Good Bye Rain".

SEE ALSO: 'K-Pop Star 2's Jeon Min Ju signals upcoming debut with MV teaser for 'Good Bye Rain'

Although they'll be debuting in August, the other 3 members and the name of the group have yet to be revealed. Stay tuned for more information!