After almost one month of teasing, Brave Brothers' girl group project, Brave Girls, has finally made their debut on this week's Mnet's M! Countdown. Comprised of five members - Eun Young (leader), Seo Ah, Yejin, Yoojin, and Hyeran - the Brave Girls are already receiving high amounts of interest thanks to their sexy looks and styles. In fact, they've even ranked first place on major portal search rankings. Their first single includes their title track, "Do You Know," along with their second title track, "So Sexy," as well as an intro track, amongst others. Unlike the industry's expectations of girl groups making their debut, with Brave Brothers' characteristic synthesizer sounds and electronic rhythms, "Do You Know" is actually a slow-tempo R&B track with a gospel style arrangement. So check out their debut stage below!