SEE ALSO: SECRET NUMBER's Léa has now left the group, following the end of her exclusive contract

SM reportedly told outlets that the group filmed their MV this past September 11 on Jeju Island, and that the group is set to make their comeback some time in October. 

Krystal recently uploaded a couple photos on her Instagram of herself, Victoria, and Amber lounging about lackadaisically in a rustic-looking bedroom. Whether these photos are a sneak peek at the group's comeback isn't certain but Krystal and Victoria sure look gorgeous (and the bed looks nice and snug)! I'm sure Amber is looking beautiful too, even though we only see the back of her head. And like Krystal, we are all wondering the same thing...where is Luna??

mood. where's lulu?

A photo posted by KRYSTAL (@vousmevoyez) on Sep 22, 2015 at 12:15am PDT

A photo posted by KRYSTAL (@vousmevoyez) on Sep 22, 2015 at 12:20am PDT