Upcoming girl group Coin Jackson made a guest appearance at DJ DOC's concert on January 29th. Before the two groups headed for the stage, they took a celebratory shot of their get-together in the waiting room. Living up to their title of being the 'most sought after guests for concerts,' the girls delivered a performance that was said to have captured the hearts of all the males in the audience. Leader Mari commented, "We participated as guests in an effort to enjoy the concert together.  It was a great honor being able to stand on stage with a great senior, and it was a precious learning opportunity as well." Lauded as Korea's first hip hop a capella girl group, Coin Jackson is preparing for their February debut. Source: Max Movie via Nate Photo: ZOOM