19-year-old male. A 3rd-year student in Class 6 at Jewel High. As the young head of his household, he looks after his three younger siblings (17-year-old Harin, 15-year-old Darin, and 13-year-old Sorin). He is Euntaek's childhood friend. He serves as the leader and bassist of the band club. Blood type A, MBTI is INFP, birthday is February 23rd, Pisces.

19-year-old male. A 3rd-year student in Class 6 at Jewel High. He has squinty eyes and his hair is quite long for a boy. He is Taerin's childhood friend and the band's vocalist. Euntaek is the one who came up with the band's name. Blood type B, MBTI is ISFJ, birthday is June 5th, Gemini.

19-year-old female. A boyish high school girl in 3rd-year Class 1 at Jewel High. She is childhood friends with Rowoon. Her name is a single syllable, "Hoon." People often mistake her gender due to her name, voice, and appearance. She plays guitar and provides vocals for the band. Blood type A, MBTI is ISTJ, birthday is December 29th, Capricorn.

19-year-old female. A 3rd-year student in Class 6 at Jewel High. She is in an international relationship with Yuki. She has secret two-tone hair. She is the drummer of the band. She always approaches her boyfriend, Yuki, first after a performance ends. Blood type B, MBTI is ENFP, birthday is September 23rd, Virgo.

19-year-old male. A 3rd-year student in Class 3 at Jewel High. He has vitiligo. He plays violin in the instrumental department and serves as the band's violin session player. He is Daan's twin brother, born 5 minutes later. Blood type O, MBTI is ENFP, birthday is December 5th, Sagittarius.

19-year-old female. A 3rd-year student in Class 5 at Jewel High. She has vitiligo. She plays piano in the instrumental department and serves as the band's keyboard session player. She is Yuan's twin sister, born 5 minutes earlier. Blood type AB, MBTI is ISTP, birthday is December 5th, Sagittarius.

19-year-old male. A 3rd-year student in Class 6 at Jewel High. He is in an international relationship with Eunmi. He is an unofficial member of the band club. He is half-Japanese, with a Japanese father. He is not affiliated with any specific club. Blood type AB, MBTI is INFP, birthday is December 12th, Sagittarius.

19-year-old male. A 3rd-year student in Class 1 at Jewel High. He has a crush on his childhood friend and classmate, Hoon. He thinks he isn't making it obvious, but... he always waits for Hoon so they can walk together. Unaffiliated. Blood type A, MBTI is ENFJ, birthday is November 18th, Scorpio.