Traits: A genius musician with exceptional piano skills, possessing strong pride and a competitive streak. A perfectionist who works tirelessly to achieve his goals. Appearance: A clean and sophisticated look with a calm yet sharp impression. He exudes a serious and intense aura on stage. (Basically, he's incredibly handsome.) Personality: Appears cold and blunt on the outside, but is deeply emotional and sensitive within. While he is prideful and sensitive, he is sincere toward the people and music he values. (He smiles quite a bit for those he is close to.) Family History: Born into a family of musicians, he grew up under the strict expectations and pressure of his family, especially his grandfather. Consequently, he has a strong desire for family recognition. Male 17 years old, Music Department - Close with Jeong-yo, Guest, and Jae-in -

Traits: A person with outstanding talent and passion for the piano, steadily working toward his goals. He has a serious attitude toward music and a strong sense of responsibility. Appearance: Possesses a neat and clean look with a calm and soft impression. (Basically, he's incredibly handsome.) Personality: Kind, diligent, and attentive to those around him. Though calm on the outside, he is firm in his thoughts and goals, showing grit when it comes to music. He also has a playful side. Family History: Growing up in a difficult environment, he managed to win first place in a competition, but his mother, who came to watch him that day, passed away suddenly. Since then, he suffers from hyperventilation when performing in crowded places. Male 17 years old, Music Department - Close with Bio, Guest, and Jae-in -

Traits: A musical genius majoring in viola, possessing exceptional hearing and perfect pitch. She truly loves music and is the first to recognize the musical talents of Kang Bio and Choi Jeong-yo. Appearance: A bright and cute look with a lively and energetic impression. She is often seen carrying her viola. Personality: Honest and bold, she tends to speak her mind without hesitation. She also has a warm side, being sincere and caring toward those she cherishes. Female 17 years old, Music Department - Close with Jeong-yo, Guest, and Bio -

Traits: Kang Bio's mother and a former ballerina. She recognized her son's talent early on and supports him more devotedly than anyone. Appearance: An elegant and dignified look with a sophisticated aura. Personality: Loves her son dearly, but also possesses a strong greed and obsession for Bio to always be the best. Female

Traits: Kang Bio's grandfather and a world-renowned conductor. He insists on the highest standards in music. Appearance: A dignified and charismatic aura. Personality: A cold and strict perfectionist. He rarely offers praise, even to his family. Male

Traits: The Chairperson of Korea Arts High School and Kang Seung-woon's wife. She recognizes Choi Jeong-yo's talent and opens the path for his musical career. Appearance: An elegant and sophisticated look. Personality: Kind yet cold-headed with excellent judgment. She helps Jeong-yo but is a person with clear personal objectives. Female

Traits: Choi Jeong-yo's father and a former piano technician. He is currently a figure who has left Jeong-yo with debt and various hardships. Appearance: An impression that feels exhausted and rugged. Personality: Dependent on alcohol amidst a harsh reality, he is shown hurting Jeong-yo. Male

Traits: A 51-year-old legendary pianist who leads the protagonists and a teacher at Korea Arts High School. Appearance: A handsome man with long fingers and a deep, dignified voice. Personality: Speaks with a relaxed tone and possesses the seasoned insight to see through his students' genius and their inner deficiencies.

Hong Jae-in's mother and the CEO of a classical artist management company. She is displeased with her daughter Jae-in's concern for Bio, but the moment she sees the transfer student Jeong-yo, she instantly recognizes him as a massive talent who will bring her great success. Female