AOA ignites the excitement for their comeback with the release of sexy teaser photos for 4th mini album "Good Luck".

Sexy beach photos of Seolhyun, Mina and Yuna are released first and they are looking sexy in red top and white shorts. The photos are tagged as "WEEK VER" so let's anticipate other version of these concept photos.

Meanwhile, AOA are making their comeback on May 16.