She wrote on her Instagram on January 26, "I apologize for deliver news like this all the time, without any prior notice. I was so happy and honored to be a part of Wonder Girls for the past 10 years. For now, nothing I say will be able to comfort your hearts, but I would like to remain a warm and good trace in your memories, 10 or 20 years from now. To Wonderful, whom I was always proud of, thank you and I'm sorry." 

Wonder Girls will be releasing their last digital single this February 10, on their 10th anniversary. 

? ???? ??? ??? ?? ?? ????? ????. 10??? ?????? ?? ???? ???????. ?? ?? ?? ??? ??? ?? ? ????, 10? 20?? ?? ???? ?? ??? ???? ?? ???? ?? ? ??? ????. ?? ?????? ????? ?? ???? ?????.

A photo posted by ??? SUNMI LEE (@miyayeah) on Jan 26, 2017 at 12:44pm PST