Dubbed as the largest boy-group in the k-pop industry currently, Double B 21 is finally all-together singing together for their new single "SOS (조난 신호)". Previously the group has been divided into four sub-unit groups namely as the Double B 21; 'Unit Sky', 'Unit River', 'Unit Earth' and 'Unit Burning'. Though 'Unit Sky' has already debuted with a single called 'One', the other sub-unit groups future debut remain unknown. Watch their new MV now!
Source: BestofAsianTv
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