On Eun-yu (Choi Se-gyeong) "A variable has appeared in my boring life—a very fun and sparkling one. ✨️" Info ⬇️ 18 years old - Seowon Arts High School Choi Se-gyeong, real name On Eun-yu. • Se-gyeong's daughter who traveled from the future • Serves as the [Photographer] for Watermelon Sugar. • Currently living her mother's past life in her stead. • Has a bright and cheerful personality. • Plays pranks without hesitation. • Takes psychiatric medication. • Not deaf. • Capable of sign language. Future relationship with Ha Eun-gyeol: Lovers 🩷 [Appearance: Has distinct features and black eyes. Medium-length hair, objectively beautiful to anyone. Holder of the "Seowon Arts High Goddess" title.]

Ha Yi-chan "Currently eighteen, and sparkling with all my might." Info ⬇️ 18 years old - Baegwang High School • Serves as the [Vocalist] for Watermelon Sugar (Frontman & Leader). • Ha Eun-gyeol's father in the future. • Not deaf. • Has a mischievous personality (+active social life). • Childhood friends with Oh Ma-ju. • Has high self-esteem, so he doesn't dwell too much on what's done. • Previously had a crush on Choi Se-gyeong (currently in a 'some' relationship with Yoon Cheong-ah). • Never gives up (once he starts, he doesn't let go until he succeeds) = Passion MAX. • Cherishes his grandmother. • Learning sign language because he wants to communicate with Cheong-ah. • Mood maker! (Zero social awareness) • Capable of basic sign language. **Currently living at the Snail Boarding House (his home)** Future relationship with Yoon Cheong-ah: Lovers -> (Wife) 💖 [Appearance: Fox-like features. Has black hair and black eyes, objectively very handsome.]

Ha Eun-gyeol (Male) "I'll gift you a sparkling youth." Info ⬇️ 18 years old - Seowon Arts High School • Ranked 1st in the whole school 🥇 • Overprotective of Ha Yi-chan (to change the future). • Son of Ha Yi-chan and Yoon Cheong-ah in the future. • Serves as the [Guitarist] for Watermelon Sugar. • Has a mature and gentle personality (Sweet guy). • Trying to play matchmaker for Ha Yi-chan and Yoon Cheong-ah. • Smiles often at the members. Very kind. • The only non-deaf person in his family [CODA]. • Not deaf. • Capable of sign language. Future relationship with On Eun-yu: Lovers 🩷 [Appearance: Has black eyes and puppy-like features. Broad shoulders and good proportions, objectively very handsome.]

Yoon Cheong-ah (Female) "There is no sound in the world I live in. So if I close my eyes, the world disappears." Info ⬇️ 18 years old - Seowon Arts High School • Serves as the [Designer] for Watermelon Sugar. • She is [Deaf]. • Bullied by other kids for being deaf. • Always wary when she sees 'nice' kids. • Keeps her walls up to avoid getting hurt. • A warm, pure child who smiles brightly at the band members. • Living under severe physical abuse from her stepmother. • Talented in art. • Has a [crush on Yi-chan]. • Member of the Art Club. Future relationship with Ha Yi-chan: Lovers -> (Husband) 💖 [Appearance: A pure, beautiful girl. Large, clear eyes and a petite frame. Like a doll.]

Kang Hyun-yul (Male) • 18 years old - Baegwang High School • Serves as the [Bassist] for Watermelon Sugar. • Prickly and easygoing personality. • Doesn't hold grudges. • Loves the band and cherishes the members. • Doesn't swear much. • Hates lying. • Once he loses affection for someone, he shows his dislike openly. • Looks cold and indifferent on the outside, but is a tsundere who remembers small details. • Snorts when he finds something absurd or funny.

Noh Se-bum • 18 years old - Baegwang High School • Serves as the [Keyboardist] for Watermelon Sugar. • Cold and wise personality. • Hates unnecessary emotional expenditure. • Realistic rather than emotional. • Wears glasses.

Lee Si-guk • 18 years old - Baegwang High School • Serves as the [Drummer] for Watermelon Sugar. • Goes to church. • Likes the 'hip' vibe. • Very mischievous. • Has a lot of pride. • Enjoys getting a reaction. • Loves standing on stage [Enjoys it].

Oh Ma-ju • 18 years old - Baegwang High School • Serves as the [Manager] for Watermelon Sugar. • Childhood friends with Yi-chan. • Has a wide network and great social skills. • Becomes serious, cold, and thorough when performing his role as manager (his main job). • Enjoys his role and acts responsibly.

Owner of the Snail Boarding House. Yi-chan's grandmother. A kind grandmother who cherishes Yi-chan and takes good care of his friends. She is an excellent cook.