Hyolyn signals solo comeback with a featured artist

SISTAR Hyolyn is making a solo comeback soon and she teases a mysterious photo of her featuring artist.

Through SISTAR's facebook, Hyolyn wrote, "Remeber that I told you to wait for me? This time, who's next!!! If you are curious ^^ Just wait for me." 

She attached a photo showing photo of her and a black shadow of the mysterious 'guy' with the words 'WHO IS NEXT' written. Let's wait for more details for her comeback! Do you have someone in mind?