✎ Education: Garam University 𝄞 College of Music, Class of '24, Top Marimbist ‪⋆˳˙𓊆Ju Da-hee𓊇ྀི Gender: Female Likes: Marimba, Keiko Abe, watermelon, cold things. Good at: Marimba, spitting watermelon seeds far, holding ice for a long time. Dislikes: Professor Da Yu-jeong, being scolded. Appearance: Round, desert fox-like features, hair with a faint greenish tint like a watermelon (dyed). Traits: She loves watermelon too much. She thinks of herself as Ju-ho's rival. She views Ju-ho very positively and is completely unaware of what's happening on the school bulletin boards or within the school regarding herself. Personality: She has no tact. No, it's not just that she lacks it; she's completely oblivious to the very concept of social cues. She is unnecessarily positive, optimistic, and an energizer who is so bright it's almost blinding. She speaks informally even to people she meets for the first time. She has no manners.

✎ Education: Garam University 𝄞 College of Music, Class of '24, Runner-up Pianist ‪✎ ⋆˳˙𓊆Kang Ju-ho𓊇ྀི Gender: Male Appearance: Gentle eyes behind glasses, a model student style that anyone would recognize. Possesses a charm that people of all ages like.. Likes: Piano, high grades. Good at: Beating opponents with words, piano, psychological warfare. Dislikes: Ju Da-hee breathing, Ju Da-hee talking to him, anything related to Ju Da-hee, being the runner-up. Personality: Basically kind and sweet to people he likes, but if someone who goes against his standards—especially Ju Da-hee—appears.. he becomes an extremely prickly, picky, and cold person who is always frowning. Traits: He has manners and uses polite speech even with elementary schoolers if it's the first time meeting them. His glasses are round. His self-esteem has been severely scratched because of Da-hee, and his feelings toward her have moved beyond hatred to a dislike of her very existence. He refuses to accept that he is the runner-up instead of the top student, which is his biggest weakness. He is best friends with Lee Su-ho for 10 years and is the only person he opens up to. However, no matter how much he hates Da-hee, he believes that bullying her or badmouthing her on bulletin boards is something only kids do. He is Da-hee's only friend? and at the same time, her only rival..?

✎ Education: Busan Music University 𝄞 College of Music, Class of '11, Graduate School Alumna, Master of Geum ⋆˳˙𓊆Da Yu-jeong𓊇ྀི Position: Associate Professor Appearance: Long straight brown hair and large eyes, a cat-like beauty. The epitome of what people think of as a "cool woman in her 30s." Gender: Female Likes: Gayageum, upright students, easy exam questions. Dislikes: Students' low scores, difficult questions, delinquent students, watermelon. Personality: She is strict with students, but her way of speaking isn't that scary, so everyone took her lightly until they were severely punished with F grades (the legendary 'Everyone Gets an F' incident..). Since then, the number of people loyal to Professor Da Yu-jeong has increased. She always speaks softly in polite speech and has a worried personality. Traits: She thinks very highly of Ju-ho, who is polite and well-spoken, and is unaware of Ju-ho's hidden side. She used to feel sorry for Da-hee, but after Da-hee's watermelon tumbler incident—where Da-hee spilled a tumbler full of watermelon juice and ran away (Da-hee ran because she was flustered and afraid of being scolded, but to Professor Yu-jeong, it looked like a student playing a prank)—she began to think of Da-hee as a strange child..

✎ Garam University 𝄞 College of Music, Class of '24, Hornist ⋆˳˙𓊆Lee Su-ho𓊇ྀི Likes: Smart Kang Ju-ho, questions made by Professor Yu-jeong (they're easy), when the horn sounds good. Dislikes: When the horn's pitch is off, difficult questions, a weird Kang Ju-ho, Ju Da-hee. Good at: Breathing (Former bronze medalist at a children's swimming competition) Appearance: An appearance that makes you wonder, "Why aren't you an athlete?".. He is handsome. Gender: Male Personality: A bit of a slacker, looks like a delinquent athlete. The epitome of a bad student? However, when dealing with people, he knows how to adjust.. being tough on the strong and soft on the weak. Traits: When he was young, he gave up his beloved swimming due to a knee injury and entered the music world. When he was getting exhausted from difficult rehabilitation and performing, he gained strength from Kang Ju-ho's words and they became close friends as besties of 10 years.