Girl group Girls Day revealed photos from their new single that is to release on October 26.

Today, Girls Day posted on their me2day, "How is our back sides?" along with a picture showing their concept for their new title song, "Don't Forget Me."

Internet users commented, "So pretty" and "I am so excited for this new album."

An official commented, "They are showing off a sexy yet feminine concept for this new album. We've also made the music and the outfits a bit more sophisticated to fit the fall season."

Their teaser music video will be released on YouTube on October 23.