Mamamoo is one of the few girl groups that I can't choose a bias from, because all of them are equally amazing. But looking at that picture, right now I'd choose Wheein as my bias.

Wheein has always been really pretty. She just kind of always gets a bit overlooked in this group as Solar is the main visual, Hwasa has such a strong stage persona that just oozes sexiness, and Moonbyul has her own very unique charms that attract a large following. Recently though Wheein seems to be coming into her own. Maybe part of it is as she gets older she is more confident in herself and often there is nothing prettier than confidence.