Dark B's first single album, "Rollercoaster," a group photo teaser that heralded a new transformation, has been released, continuing its heated comeback fever.

At midnight on October 22nd, Brave Entertainment, the agency, released two group concept photo teasers through Dark B's official SNS, showing a successful transformation.

First of all, the members in the released image showed their mature beauty with a fashion matched with chic and modern leather items. In addition, it was directed in moody black and white, adding a sense of weight, making the members look forward to the darker emotions. The released photo teaser then showed the members fully digesting color training suits with colorful colors. It drew attention by creating an atmosphere contrary to the previously released black-and-white image and captivated fans by giving off an unrivaled aura with poses and eyes that stand out for each personality.