Group NU'EST member Aron showed a teaser revealing his six pack.

With their comeback approaching soon, NU'EST revealed the images of their first official album 'ReBIRTH.'

In the pictures, Aron showed a cute face holding up his shirt wit his mouth and showing his body.

While preparing for the album, Aron trained and worked out hard to build up a perfect body. Although he was one of the skinniest members in the group, he showed that his hard work has paid off.

NU'EST's new album will be the first official album since two years of debuting. It is also notable that all the members are now adults and are changing their concepts.