A video of the rehearsal for the 2017 DMZ Peace Concert held in Paju on August 12 is belatedly receiving increased attention. Before the official concert, during the rehearsal, all the performers went onstage and sang the final song together. The lineup including Ailee, MAMAMOO, Cosmic Girls, B1A4s Sandeul, BTOB, and more sang the Korean national anthem.
As the song transitioned into the instrumental part, Ailees powerful vocals exploded, and behind her, the members of Cosmic Girls jaws dropped and looked stunned. Even the members of MAMAMOO appeared to be shocked as well. Moonbyul started clapping and Wheein, who was standing directly beside her, touched her in surprise as well.