DKB is a nine-member boy group under Brave Entertainment. They debuted on February 3, 2020, with the mini-album Youth. Their name is short for "Dark Brown Eyes."

On April 15, the group released a teaser for their fourth mini-album, Rebel, which will be released on April 28. The mini-album will consist of four songs, including their previously released single, Rollercoaster. In addition to Rollercoaster, the album includes Sober, Get Away, and a Sober Remix.

On April 20th, they began showing off individual concept photos starting with Yuku, Junseo, D1, GK and Lune. Take a look at the photos below!