BtoB, have dropped the first teaser for their upcoming special album.The group released the teaser image on their official Twitter account yesterday (August 11), unveiling the special album’s title, ‘4U:OUTSIDE’, as well as its release date of August 30 at 6PM KST.Consisting of Eunkwang, Peniel, Minhyuk and Changsub, BtoB 4U is a sub-unit of the boyband made of its currently active members.