Why do they sound like there are no backing vocals?? Like it sounds super live ㅠㅠ

HELLO MONSTERS THE FIRST STOP
#HELLOMONSTERSinSeoul_D1
#BABYMONSTER #베이비몬스터
#HELLOMONSTERSinSeoul_D1 #BABYMONSTER #베이비몬스터