f(x)'s cutie Krystal poses with style in her teaser images

Your beloved cutie Krystal is now out with her teaser images for f(x)'s comeback with "4 Walls"!

She looks adorable in circular sunglasses, exuding that retro vibe that the members before her have likewise done in their own teaser images. Striking interesting poses that show off her long, slim legs, Krystal gets you excited for their comeback even more!

And while some people may ask to "hold the anchovy," she goes, "Why not have a whole fish in my pizza?" Why not, indeed. Check out her pics below and wait for Amber's!