Topp Dogg chose to have 13 members because they want to be the 'Hip Hop Super Junior'

Topp Dogg revealed that they planned the group with 13 members to become the 'Hip Hop Super Junior'!

When Topp Dogg was originally planned, Stardom Entertainment used to introduce the group as the 'Hip Hop Super Junior'. The Topp Dogg boys are like Super Junior in the sense that the members were not chosen under one concept - all of the Topp Dogg members have their own color, much like the Super Junior members.

Other than that and the number of members, the Topp Dogg boys will also be focusing on their musical color for their unit activities, just like Super Junior did for their own unit promotions.
Topp Dogg will debut through their showcase on the 22nd, broadcast first on the 23rd, and release their song and MV on the 24th.