DKB (다크비), short for Dark Brown Eyes, is a nine-member boy group formed by Brave Entertainment. The members consist of E-Chan, Teo, D1, GK, Heechan, Lune, Junseo, Yuku, and Harry-June. They made their official debut on February 3, 2020 with the mini album "Youth."
On September 30, 2019, a group twitter account for Brave Entertainment was launched along with a teaser image. Following this, on October 25, a promotional film titled "Move the Crowd" was released. Individual films were announced periodically in the following order from October 28 to November 26: E-Chan, Teo, D1, GK, Heechan, Lune, Junseo, Yuku, and Harry-June. The second promotional film "Keep Your Head Up" was released on November 28.
On December 3, individual film behind photos were released for E-Chan, D1, Lune. The next day, individual film behind photos were released for Heechan, GK, and Junseo. The remaining photos for Teo, Yuku, and Harry-June were released on December 5.
Footage of the members in the studio and practice room were uploaded on December 10 and December 13, respectively. On December 17, footage of them at the study room was released. On December 19, 24, 27, and 31, a four part footage video titled "Overnight" was released.