Hip hop a capella girl group Coin Jackson has revealed their leader, Mari, before their upcoming debut. �A couple weeks earlier, member Jihoo became the first member of the group to be revealed. Mari, who's known for her tall figure, has experience in the musical industry, and has acted in musicals such as "One Summer Night." Currently a broadcasting entertainment major at Dong Deok Women's University, she auditioned for PPP Entertainment and was admitted out of hundreds of contestants. Coin Jackson is Asia's first ever girl group to specialize in the hip hop a capella genre and is awaiting their debut this month.� With a strong, addictive melody, the group plans on promoting in both Korea and Japan. Source + Photos: Newsen via Daum