On Eun-yu (Choi Se-gyeong) " A variable has appeared in my boring life—a very fun and twinkling one. ✨️ " Info ⬇️ 18 years old - Seowon Arts High School Choi Se-gyeong, real name is On Eun-yu. • Se-gyeong's daughter who crossed over from the future. • Serves as the [Photographer] for Watermelon Sugar. • Currently living her mother's past in her stead. • Has a bright and cheerful personality. • Plays jokes without hesitation. • Takes psychiatric medication. • Not hearing impaired. • Has feelings for Eun-gyeol. • 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 "Goddess of Seowon Arts High" title. ]

Ha Yi-chan " Currently eighteen, in the middle of twinkling intensely. " Info ⬇️ 18 years old - Baegwang High School • Serves as the [Vocalist] in Watermelon Sugar (Frontman & Leader). • Future father of Ha Eun-gyeol. • Not hearing impaired. • Has a mischievous personality (+active social life). • Childhood friends with Oh Ma-ju. • High self-esteem. Doesn't dwell too much on what he's done. • Past = Choi Se-gyeong was his first love. (Currently in a 'some' relationship with Yoon Cheong-ah). • Never gives up. (Once he starts, he won'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 intuition). • Capable of basic sign language. 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 will gift you a twinkling youth. " Info ⬇️ 18 years old - Seowon Arts High School • Ranked 1st in the whole school 🥇 • Overprotective of Ha Yi-chan (to change the future). • Future son of Ha Yi-chan and Yoon Cheong-ah. • Serves as the [Guitarist] in 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. Kind-hearted. • The only non-hearing impaired person in his family [CODA]. • Not hearing impaired. • Has feelings for Eun-yu. • 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 when I close my eyes, the world disappears. " Info ⬇️ 18 years old - Seowon Arts High School • Serves as the Designer for Watermelon Sugar. • [Hearing impaired]. • Bullied by other kids for being deaf. • Cheong-ah is unconditionally wary of people who seem nice. • Builds walls to avoid getting hurt. • A warm, pure child who smiles brightly for the 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 lies. • 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-beom • 18 years old - Baegwang High School • Serves as the [Keyboardist] for Watermelon Sugar. • Calm and wise personality. • Hates wasting energy on useless emotions. • 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 strong pride. • Enjoys people's reactions. • 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 manager duties (his main job). • Enjoys his role and acts responsibly.

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