"Heavenly harmony, Melody!" Goal: To show everyone our absolute best! A 4-member girl group. Their keywords are friendship, effort, and growth. They grow together by filling in each other's shortcomings. People who see New Melody's performances say it makes them smile. -Members- • Chae Nara: Female, Leader of New Melody • Yoon Sia: Female, Main Dancer of New Melody • Yang Song-i: Female, Main Vocalist of New Melody • Kang Hera: Female, Visual of New Melody -Manager- • Jin: Male. Manager of New Melody

"Let's become the brightest stars!" Goal: To show the perfect image! A 3-member girl group. A team of exceptional skill, they are known for their haughty and elegant charm that fits their concept, often called the Queens of the Stage. As a highly skilled team, they win often and book schedules quickly. -Members- • Karisma: Female, Leader of Dolls • Lili: Female, Vocalist of Dolls • Rose: Female, Dancer of Dolls

"Sweetly again today!" Goal: To look like the cutest things in the world! A 3-member girl group. Composed of true princesses with cute and quirky charms. Peach has the ultimate adorable charm, Vanilla always looks after the members, and Berry is the group's best at aegyo. They show the world's greatest cuteness on stage. -Members- • Peach: Female, Leader of Macaron • Berry: Female, Vocalist of Macaron • Vanilla: Female, Dancer of Macaron

"Always like a burning Friday night!!" Goal: Toward a higher peak! A 4-member boy group with a massive fanbase. New Melody's manager, Jin, was supposed to debut as the leader of Friday, but he was injured while saving Hyunwoo during a rehearsal. He had to give up being an idol and became a producer instead. Even now, the members call Jin their true leader and respect his skills. -Members- • Hyunwoo: Male, Leader and Lead Vocalist of Friday • Yujin: Male, Eldest member and Sub-vocalist of Friday • Kunta: Male, Dancer of Friday • Yi-ri: Male, Rapper of Friday

"Four Seasons, here to grace the finale!!" Goal: Never forget our roots! A 4-member girl group. An elite squad personally trained by Calliope. Called the idols among idols, they enjoy immense popularity and each member possesses outstanding skills. However, Sunshine and Storm do not get along, seemingly due to Sunshine's philosophy that life is a solo journey. -Members- • Sunshine: Female, Leader of Four Seasons • Storm: Female, Vocalist of Four Seasons • Snow: Female, Dancer of Four Seasons • Wind: Female, Main Vocalist of Four Seasons

Female. Chairwoman of the school. Formerly active in the duo "Stardust" with Lina, she is now a solo artist and a former Muse.

Real name: Big J. However, he is simply called "The Principal." Male, the principal of the school.

A legendary 2-member girl group formerly consisting of Calliope and Lina (Reina). They are known to many children today as the "Legendary Duo." They are currently disbanded; Lina left the entertainment industry, while Calliope became a Muse as a solo artist. Initially, the two were close, but after their debut, the public gravitated toward the bright and kind Lina. This led to aggressive solo fans demanding Lina go solo. Calliope composed a duet titled 'Galaxy' to perform with Lina, putting her heart into the team. However, Lina performed the song alone on a solo stage and became the Muse by herself. Calliope viewed this as a massive betrayal. While Lina had her own reasons, the relationship became irreparable, leading to the group's dissolution.