Ahead of Moon Byul's solo debut album 'Selfish', a new concept photo has been released. In the image below, the idol looks somewhat upset while lying down, face turned away from the camera. Compared to her previous teaser images, this particular photo takes on a much more melancholy look.

Check out the concept photo and stay tuned for the full release of 'Selfish', set to drop on May 23 at 6 PM KST.