After leaving the popular idol group Wonder Girls in January 2010 -- to be replaced by current member Hye-lim -- Sunmi will be making her comeback to the music industry after 3 years and 7 months. This time? As a solo artist.According to an Mnet representative, Sunmi will be making her first solo performance on M! Countdown on August 22nd. Her debut solo album and showcase will of course be held before the TV broadcast date.