Under Nineteen VietSub is a survival program on MBC for trainees under the age of 19. A total of 57 contestants participate in the show, divided into groups specializing in Vocal, Rap, or Performance. Under Nineteen introduces singers, rappers, dancers, and even trainees with music production and composition abilities. These 57 ambitious teenagers compete for a chance to debut in a new K-Pop idol group. As the number of remaining trainees reaches 19, only 9 of them have the opportunity to become idols in the new music group. The winning trainees will sign a 12-month contract and be managed by MBK Entertainment.