The girls rush through the streets of Seoul promoting the concert and handing out colored balls (Major A - Red; Major B - Yellow; Minor A - Green; Minor B - Blue). Before the show starts, attendees will place the ball in the correct group's bin to show which team did the best job promoting the show. The team that gets most of their balls back will be safe in the Major line up. After the performances, audience members are given white balls to vote for the performance they liked the best out of all four on their way out. This vote will determine the other members of the Major team.
승부 앞에서 걸그룹 이미지는 없다! 식스틴 멤버들의 처절한 예능본능! 즐거운 마음으로 예능 캠프를 즐겼던 식스틴 역대급 반전 멤버들이 직접 뽑는 메이저 오직 멤버들의 선택으로만 결정된 승강 '게릴라 콘서트'미션! 게릴라 콘서트로 바뀌게 될 식스틴 멤버들의 운명은?!
