It has been reported that the members of Playback will be joining the lineup of contestants on 'Mix Nine' and that Ma Eunjin, a former 'K-Pop Star 6' contestant, will be reuniting with Yang Hyun Suk, a former judge on the show.

On October 13 KST, Playback's agency Coridel Entertainment released a statement through the group's official fan cafe to confirm that the members will be joining the show. They said, "After a long period of inactivity and preparing for a comeback, the group was given an offer to appear on the show 'Mix Nine'. We decided to go on the show because we believe that it will be a good chance for each member to show their talents and abilities. The members of the group are preparing and working hard to show their best and are aiming to release an album mid-October so please stay tuned and continue to support the girls."

'Mix Nine' will be airing its first episode on October 29.