Aegyo, meaning the act of cuteness in Korean. Aegyo sal is the term for the piece of skin under your eyes (Eye Bags), which pops up whenever you smile. This flab of skin makes you cuter, appear more youthful and baby-like. See pictures below. 

If you naturally have obvious aegyo sals, you're lucky! However, if your aegyo sal isn't as obvious, try this.

Accentuate the area by using some light oatmeal eyeshadow, and using a pointy tiny brush. Apply it under your eye bags, to make it appear bigger. Your eyes will also seem wider! 

Warning! : Don't overapply the eyeshadow, or you'll look like a zombie with dark circles under your eyes! LOL. 

-floramaknae