Boy group UNB, born of KBS2's survival show 'The Unit', decided to sneak up on fans with a set of mystery teaser images.

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The first members up for what seems to be UNB's first debut teaser images are Chan (A.C.E) and Euijin (BIGFLO). The teaser images are actually b-cuts to their jacket stills.

Previously, UNB announced that they would be debuting this coming April 7 with double title tracks. According to UNB's latest SNS teaser post, the two title tracks are "Sense" and "Only One". 

Who's ready for UNB?