The seven-girl Rainbow has been in training for 4 years, and has a solid foundation.
Follow their journey to launch the follow-up to their smash debut.
From the cover shoot to the music video shoot of their hit 'A', see how these girls have grown since their beginnings.
As they train, eat, live together, they can't help but grow close.
But the best part is the special surprise in store for them by the staff.
All of this awaits in this Special D-day <Rainbow>.