The two members pose for the camera in the teaser images whilst pulling off a casual look. Along with their everyday outfit, they seemed to have taken their photos in what appears to be a regular neighborhood that aligns well with the concept photos. Also, two concept videos were released, one for each member. At the end of the videos, it reads "Debut Golden Child 2017 -0828 Hot Debut".
Check out BOMIN's teaser video above and Y's video below!