Nickname: Goma-Seri Gender: Female Age: 19 Height: 167cm Weight: 48kg Characteristics: Her severe curly hair is her biggest lifelong insecurity. She carries out a desperate mission to straighten it before the most important confession of her life. She is always bright, full of positive energy, high-spirited, and possesses a refreshing charm. A Busan native through and through, she naturally slips into Busan dialect monologues when she gets emotional or close to someone (uses a lot of dialect). Likes: The school's top star 'Kim Hyun' (the target of her big confession at the start). Silky straight hair (Magic Straight Perm). The cool Busan sea and spending time with friends. Dislikes: Rainy or humid weather (because her curls puff up uncontrollably). Irresponsible situations that mess things up or force her to move away before she can confess. She liked Kim Hyun and even made a plan to call him out, but she eventually fell for Yunseok and couldn't go through with the confession.

Gender: Male Age: 20 (Attends high school as a senior; held back one year) Height: 183cm - 185cm Weight: Early 70kg range Characteristics: A transfer student from Seoul with a complicated past. He moved to Busan with his mother to escape his father's domestic violence and abuse, leading him to give up on the college entrance exam. While he appears blunt and cold on the outside, he is a 'tsundere' with a deep and warm heart. He is the son of the owner of 'Jangmi Hair Salon.' He forms a bond with the protagonist, Park Seri, after she rescues him from drowning in the sea. Likes: Park Seri. He truly falls for Seri, who approached him without hesitation and opened his heart. His mother, the only family member he wants to protect from his father's violence. Walking quietly along the beach; he likes quiet places where he can organize his complicated thoughts. Called 'Hyung' by Baek Seongrae.

Gender: Male Age: 19 Height: 183cm Weight: 68kg Characteristics: The undisputed most popular guy in school, loved by all students. He has not only handsome looks but also excellent athletic abilities. He draws attention wherever he goes, but he is kind, friendly, and always has a fresh smile, getting along well with everyone. He is also the long-time crush of the protagonist, Park Seri. Likes: Girls with long, silky straight hair (rumored to have liked Lee Hyori from Fin.K.L in the past). Sports and outdoor activities (especially enjoys swimming in the sea). A comfortable atmosphere where he can laugh and hang out with people. Dislikes: Situations where someone is forced into an awkward spot or where the mood becomes heavy because of him. Being dishonest or beating around the bush (he shows a direct attitude when being confessed to, saying, "Hurry up and say it, I'm nervous").

Nickname: Dolmen Gender: Female Height: 164cm Weight: ?? Characteristics: Her severe curly hair was a lifelong complex, but she received a 'Seoul Magic Straight' treatment at the newly opened Jangmi Hair Salon for 200,000 won—a fortune at the time. She appears perfectly transformed with silky bobbed hair, serving as a decisive catalyst for Park Seri, who shares the same complex, by providing salon information. She also likes Kim Hyun and even asks him to be her partner during dodgeball.

Female Park Seri's friend. She helps Seri with her plans.

Female Same as Ma Solji.

Female Same as Ma Solji.

Male Nickname: Bbaek-Seongrae He talks a looooot and is very noisy. Same as Ma Solji.