Their blog and SNS accounts just revealed this teaser image of a 'project film' starring the members of the two boy groups. We see the 12 members all lined up in front of a vintage building, along with the words 'dimension'. We're also told that this film will be premiering on September 7 at 9 AM KST!

The suspense is killing us, but we only have to wait a few more days before we find out what this all means!