Red Velvet (레드벨벳) - Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb DumbDumbDumbDumbDumbDumb DumbDumbDumbDumbDumbDumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dumb Dum..