Hwa Sa revealed concept photos for her 'O' mini album.
In the teaser images, Hwa Sa takes on a chic concept as a city girl. 'O' is the MAMAMOO member's upcoming 2nd mini album set to release on September 19 KST.
Stay tuned for updates on Hwa Sa's comeback!
SEE ALSO: Viewers note the stark difference between MAMA venues in the U.S. and Japan