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RBW, home to MAMAMOO and Vromance, is currently preparing to debut a boy group currently just called RBW Boyz. The rock band MAS is a group that debuted back in 2016 as MAS0094, and then changed their name to MAS in 2017 after moving labels to RBW. Both RBW Boyz and MAS will be showcasing their skills through a pre-debut show 'Sparkling Piece', taking place this April 28 at 5PM KST at the Yes24 Live Hall. 

Many may recognize the 5 members of MAS from KBS2's 'The Unit', while members of RBW Boyz made their names known through Mnet's 'Produce 101' season 2 and JTBC's 'Mix Nine'. But in addition to members known through 'Produce 101' and 'Mix Nine', RBW Boyz recently introduced a brand new trainee - named Xion - with another mystery member, to be revealed soon.

Check out the RBW Boyz and MAS members' individual 'Sparkling Piece' posters below, while you wait for more on the two teams.