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.