They've certainly matured from their 'd.o.b' days, as you can see from teaser photos of Youngbin, Inseong, Jaeyoon, and Dawon released on September 28. Teaser images of the group's remaining 5 members will be revealed tomorrow!

There's supposedly a hidden message from SF9 for fans in the teaser images if you look closely, so get out your magnifying glasses! Their 1st single album 'Feeling Sensation' drops October 5!