After the sudden news of f(x)'s comeback, the group continued to get fans hyped up with more mysterious teaser images!

The girls seem to be going for a school girl look in their matching white collared shirts and skirts, and also gave off a vintage vibe through the edited photos. It is still unknown what their concept will be but judging from fans' experience with SM Entertainment teasers, you might want to be prepared as the end product could end up being quite different from the teasers!

Check out the new images while you wait for f(x)'s comeback with their 2nd full length album 'Pink Tape' On July 29!