The concept of the show is to form male and female unit groups of nine members each, among idols who had already debuted.
[4] The show is aiming to give them a fair chance to demonstrate their talents that they may not have been able to showcase before.
KBS announced in July 2017 that they had started production of a reality show under the working title The Final 99 Match.
[4] On August 2, the show's first teaser was released under the new title The Unit, stylized as The Uni+, which stands for "You and I Plus".
When 90% of the audience vote for the contestants, which is known as "Super Boot", the whole group will be able to join the show immediately.
[5] The Booting Evaluations were held at the Kintex Hall 9 in Ilsan between September 29 and October 1, 2017.
On October 13, The Unit dropped the music video for the competitors' first challenge "My Turn", which also aired on that day on KBS's Music Bank, featuring Sonamoo's Euijin and IM's Kijoong as the girls' and boys' center respectively.
All performances are self-arranged by the contestants themselves, with live band accompaniments for the Vocal and Rap-Vocal categories.
The winning team for each gender in this mission will have their songs labelled as title tracks in the single albums categorised by gender and the 2 songs' music videos will be directed by well-known directors Hong Won-ki and Lee Gi-taek.