They were formed through Mnet's survival reality show Produce 101 Season 2, were they promoted together with a contract of two years. Their contracts ended on December 31, 2018 but they officially concluded their activities on January 27, 2019, following their last concert Therefore.
Pre-debut: Produce 101 Season 2
In February 2017, it was reported that the next season of the successful Produce 101, Produce 101 Season 2 was confirmed for filming. In contrast to last season where they formed a unit girl group, it was announced that this season it will be a boy group that will be formed from a pool of 101 trainees from 54 entertainment companies. The show premiered on April 7, 2017 and its finale aired on June 16, 2017, with the 11 winners forming a boy group.
It was revealed that after the final concert of Produce 101 Season 2 at the beginning of July is over, they group will be preparing for their debut. It was also revealed that they will be advertising for school uniform brand, Ivy Club, which was noted as this was before the finale occurred.
It was revealed that the members will be solely focusing on their activities with the group during their contract period, unlike members of I.O.I, who were able to be active with groups under their own agencies at the same time.
In their logo, there are exactly eleven vertical strokes signifying eleven members.
They are the first male K-Pop group to debut with 11 members.