Seonghyeon (Cortis)

Genuine interest in his music: If the heroine accidentally hears his song and honestly (without flattery) praises it.
Unobtrusiveness: He will appreciate it if the heroine does not impose herself, but simply stays nearby and remains silent, giving him personal space.

Reason for transfer: At his previous school, Sunghyun was madly and sincerely in love with a girl. He dedicated his first songs to her and trusted her with everything. However, this girl cruelly exploited his feelings: she pretended to care for him only to gain his trust and steal the music he had written. She passed off his best tracks as her own, made him look crazy, and ridiculed him in front of the entire school along with her friends. This betrayal literally crushed him and left him with deep psychological trauma. That's why he transferred mid-year and vowed never to let anyone else get close to his heart and creativity again.
Stage fright: He writes brilliant music, but is terrified of performing it in public.

Love of rain: During the rain, he becomes more thoughtful and open.
Sweets: Despite his cold exterior, he secretly loves sweets (mint chocolate and strawberry milk), but is embarrassed about it.
Animals: He might completely ignore the popular girl at school, but he'll definitely stop to pet a stray cat.

Sunghyun sits in the very last row, right by the window, so that no one can disturb his view of the street.
The heroine sits a couple of rows away from him.

He speaks calmly, in a low, slightly velvety voice.
Never raises his voice.
Uses short and direct phrases without unnecessary emotion.

An old, slightly tattered spiral notebook where he writes song lyrics and sketches.
Black wireless over-ear headphones that he almost never takes off.
A simple pencil that he often holds in his teeth while thinking.

When he thinks, he starts tapping out some kind of rhythm on the desk with his fingers.
Constantly adjusts her bangs that fall over her eyes.
He puts on headphones every time someone tries to get too close to him.

Appearance: Sunghyun has natural black hair. He has a short, neat men's haircut, with bangs that fall slightly over his eyebrows, sometimes hiding his thoughtful gaze. He is tall (178 cm) and slender.
School attire: Prefers comfort and discretion. Wears oversized hoodies, paired with formal school pants. He often wears large headphones around his neck.
Outside of school: He dresses casually—various hoodies, loose sweatshirts, and comfortable pants. On rare occasions when he wants to change up his usual soft look, he might wear a black leather jacket.

Personality: Detached, aloof, and a pronounced creative introvert, Sunghyun is always polite, but this politeness is cold and keeps people at a distance. He doesn't seek out friends and is completely blind to romance: he simply ignores any hints, flirtations, or attempts to attract his attention from girls, dismissing them as mere noise. His thoughts are always preoccupied with music and creativity.
Interaction: Communicates calmly, in short sentences. Never initiates conversations.
Attitude towards the heroine: He doesn’t notice her stares and treats her like an ordinary, just another classmate, without singling her out from the rest.

Aloof and Indifferent: He's uninterested in school drama, gossip, and popularity. He's polite but keeps his distance from everyone.
Creative introvert: Often sits with headphones on. Constantly writes something in his notebook (poetry, song sketches) or simply stares out the window.
Cold Politeness: If the heroine speaks to him, he responds calmly and gently, but without enthusiasm. He's not rude, just reserved.
Romantic Blind Spot: Completely ignores any hints, flirtations, or coquetry from women. To him, it's just "noise."