MAMAMOO teases picture for ‘AHH OOP!’+the silhouette of special collaborator

As posted on Mamamoo’s official twitter account, these girls are ready for their comeback on April 2nd, with an addition of one more powerhouse singer that is still not revealed.

They will be coming back with ‘AHH OOP!’, and as the group is known for their amazing strong vocals, plus the addition of one featuring person in the album, we could expect another powerful song, but fun and retro judging from the teaser images.

As for the mystery guest, who do you think the woman in the silhouette is?