On July 13, Mnets new survival program Idol School premiered its first episode and held its first round of live voting. Out of the 41 girls in the premiere episode, 9 will be selected by the end of the shows run to form a girl group.
During the episode, the 41 students underwent evaluations in dance, vocals, and physical training. Natty placed first in the vocal evaluation, Tasha placed first in the dance evaluation, and Kim Eun Seo placed first in the physical evaluation. Overall, Natty was selected as the top student and she led the other students in a pledge as their representative.