She just has this charm about her, it makes her look majestic, royal, high-class, ya know?
It's a little hard to describe, but some of it has to do with her having a "mixed" kind of appearance - out of the 5 girls you'd probably bet that Gyuri's the one who MIGHT get classified as mixed, even though that isn't too likely.
Bleh, it's a little hard to describe, but she just really has this charm/aura about her that makes me look at her the most.
Not to mention she's drop dead gorgeous (even without makeup!!).