Under Nineteen (Korean: 언더나인틴) was a survival show on Munhwa Broadcasting Corporation for trainees under the age of 19 years old.

Under Nineteen introduces singers, rappers, dancers and also trainees with the ability to produce music and choreograph.

57 aspiring boy band members will come to compete for a spot to be in a new K-pop idol group.

The Vocal team performed their song "Go Tomorrow" and was ranked by the studio audience and online viewers.

After the final performance, the trainees gather to hear the results of the on-site voting as well as their second mission, position evaluation.

In the midst of preparing for their second ranking evaluation, the 57 trainees are faced with the reality that they must say goodbye to 8 members.

Super Junior's Shindong and Leeteuk as well as GFRIEND’s Yerin make a guest appearance as MCs for a special corner called "Weekly Trainees".

The combinations of each unit was chosen by fans on the online voting system for the following songs: "Fake Love" by BTS, "Growl" by Exo, "Sherlock" by SHINee, "Fiction" by BEAST, "Mirotic" by TVXQ and "Be Mine" by INFINITE.

Special director J-Hope stops by to help the "Fake Love" team with the choreography and gives his expertise.

During the announcement So Hyun broke the news about Ji Jin-seok and Bang Jun-hyuk's departure for health reasons.

With special MCs, Shindong and Ye Rin, we get a look at the trainees’ first audition, their work fashion, and a prank that shows their character.

After months of blood, sweat, and tears put into this competition, UNDER NINETEEN is finally coming to an end.

Today is the long-awaited live broadcast to find out who will make it into the final 9 and debut.

The top 9 contestants were determined by online and onsite voting, the results of which were announced at the end of each episode.

During the last episode aired on February 9, 2019, Kim So-hyun and Leeteuk announced the unit boy band's name: 1THE9 (Hangul: 원더나인).