Rookie boy group DKB has unveiled a moody concept trailer ahead of their 1st single album comeback. 

In the 'Rollercoaster' concept trailer, the DKB members wander through a dark and abandoned scene, showing dispirited expressions. The group has yet to reveal more details for their comeback single album, so fans will have to stay tuned for additional teasers throughout October.

DKB's comeback is slated for October 28 at 6 PM KST. What kind of sound and image do you want to see from DKB this time?