Updated November 19 KST:

The mystery continues, but it appears that this release may be a collaboration or a new sub-unit that will include member Zico according to his latest Instagram post!

Original November 18 KST:

It looks like Block B has something special cooking for fans!

On November 18 at midnight KST, the group dropped a mysterious image teaser hinting at a potential release before the end of this month.

No details other than the date of the release, November 28, were revealed, getting fans guessing about what the group might have in store for them.

Any guesses?