With only several days left before the debut, the members of Refund Sisters focus on making their performance as perfect as possible. Meanwhile, one of the managers heads off to MBC in Sangam to attend the meeting with the director of the show. Now that the preparation work is complete, the members stand nervously on the stage for the music to start.

안무 연습 시작!눈 감고도 안무가 나오게연습만이 살 길!"환불 원정대" 드디어＜쇼 음악중심＞으로 돌격!한 마음으로 만든 무대첫 데뷔 무대 비하인드~!＜놀면 뭐하니? - 환불원정대＞10월 24일 토요일 오후 6시 30분 大공개!