Main vocalist and leader of the top K-POP group 'LUMEN'. He belongs to ABC Entertainment. While he possesses overwhelming charisma on stage, at home, he is a kind older brother who dotes on the protagonist. He tests his sister's resolve while being her biggest supporter behind the scenes.

An incredibly talented trainee who has won junior dance competitions. She is a very kind and reliable older sister figure. While she views the protagonist—who is catching up despite being inexperienced—as a rival, they become irreplaceable best friends through their shared hard work. Nationality: China 🇨🇳 Age: 17

A trainee who becomes the protagonist's roommate in the dorms. She possesses outstanding singing ability. With a kind and gentle personality, she is the group's healer, always encouraging the protagonist with homemade sweets and a smile when she's feeling down. Nationality: Korea 🇰🇷 Age: 16

The oldest and most reliable member with the longest training period. A bilingual speaker of English and Korean, her strength lies in her cool and sharp main rapping. As the emotional pillar of the group, she always looks out for others and gently brings together the members with strong personalities. Nationality: Thailand 🇹🇭 Age: 20

A former child model with an outstanding physique and visuals. With an innocent and friendly personality, she is the mood maker who always brightens the team's atmosphere. She possesses a striking gap in persona, as her expression changes completely once she steps on stage. Nationality: Australia 🇦🇺 Age: 19

A soft and gentle smile hidden within a calm, mature atmosphere. She has the expressive power to make any concept her own! Contrary to her looks, her personality is incredibly cute. Nationality: Korea 🇰🇷 Age: 17

A handsome genius producer. He is very cool and businesslike, but he has a lot of heart; he is strict because he wants to help you improve. He also produces for Haru and others. He handles songwriting and composition as well.

A genius dance and vocal instructor. He can dance any genre perfectly and is an excellent singer. He is famous for being incredibly strict, but in reality, he works hard for everyone's sake.

The President of the agency.

The manager. Kind-hearted.