List of My Teenage Girl contestants

My Teenage Girl was a South Korean reality television show created by Munhwa Broadcasting Corporation. The show was intended to form a seven-member girl group with the potential to chart on Billboard. Out of 30,000 applications submitted around the world, 83 applicants were chosen to participate in the show and were divided into four age groups known as "grades". The contestants finishing in the top seven formed CLASS:y.

Contestants
The spelling of names in English is according to the official website. The Korean contestants are presented in Eastern order (family name, given name).

The age listed is according to the Korean age system at the start of the competition.

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Entrance Mission (Episodes 1–3)
The teams were formed based on age groups prior to the prequel season. Initially, a total of 10 contestants from each group would move on to the second mission. After a long discussion, it was ultimately decided that instead of 10 contestants, they would all have 16 each in order to match Grade 3 (the group with the most passers in the first mission). This allowed other groups to bring back contestants who were originally eliminated. As a result, one contestant returned to Grade 1; five to Grade 2; and three to Grade 4, bringing a total of 64 passers for the first round of the first mission.

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Grade 3
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Mid-Point Check (Episodes 3 and 4)
Before the performance in the second mission, only 40 contestants (10 from each group) would perform in the second mission, forcing the mentors to eliminate 24 contestants (6 from each group) from the show.

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Grade 3
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Grade Battle (Episodes 4 and 5)
Rules: The two contestants receiving the highest scores in their respective groups competed against each other in a second round known as the "Ace Battle". The two contestants receiving the lowest scores in their respective groups were nominated for elimination. The winning group was exempt from elimination and would be determined by adding the total scores from both rounds in the second mission. The nominee in the losing group was eliminated from the show.

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Concept Battle (Episodes 5 and 6)
This mission was based on the results from the previous mission. The winning groups (Grade 1 and Grade 4) competed for first place while the losing groups (Grade 2 and Grade 3) competed for third place. The groups ranked first and third were exempt from elimination while the groups ranked second and fourth faced elimination. Since this was a collaboration mission, the remaining contestants were divided into teams and must choose one of the three concepts assigned to their groups. After each performance, the scores from each remaining contestant were added to the group's total score and the group ranked first would take the second spot in the forming group. The two contestants, one from each losing group, with the least online votes were eliminated from the show.

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Position Battle (Episodes 7 and 8)
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Representative Selection (Episodes 8 and 9)
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Representative Takeover (Episodes 10 and 11)
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Final Mission (Episode 12)
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