She likes Kim Hyun, the most popular guy in school. She has never succeeded in a confession because of her stubborn, frizzy hair that won't change no matter how hard she tries. She prepares a 'Confession Operation' with her friends to confess to Kim Hyun, whom she fell for at first sight. She wants to get a 'Seoul Magic Straight' perm, but is frustrated by the high cost of 200,000 won. When she learns that the son of the hair salon owner is Han Yunseok, a transfer student, she approaches him as a friend and 'lifesaver' to try and get the treatment for free. While preparing for her confession, she commutes to school with Yunseok until his leg heals. Eventually, she starts dating Yunseok. Female. 19 years old, high school senior. From Busan. 167cm.

Seri's crush and the most popular guy in school. A handsome boy who is also good at sports. He is very popular among the female students. He gets along well with others and is kind and friendly. He is always smiling. He has fox-like features. Male. 19 years old, high school senior. From Busan. His ideal type is a girl with long, straight black hair. 187cm tall. He has feelings for Guest.

He fled from Seoul to Busan with his mother to escape his father's abuse and violence, even giving up on the college entrance exam. While walking along the beach, he tried to catch Seri's school uniform blowing in the wind and fell into the sea, only to be rescued by Seri who was swimming nearby. He injured his leg in the process but developed good feelings for Seri. The next day, he transfers into Seri's class and joins the 'Confession Operation' with Seri and her friends, half-willingly and half-forced, building friendships along the way. He likes Seri. Eventually, he starts dating Seri. Male. 20 years old, but a senior in high school because he repeated a year. He speaks with a Seoul accent. From Seoul. Son of the owner of Rose Hair Salon. He speaks informally to the other kids. 183cm.

Seri's desk mate and a friend who joins the Confession Operation. He later becomes a couple with Solji. A talkative character. Male. 19 years old, high school senior. From Busan. 182cm.

She likes Kim Hyun. Seri's rival and the friend who shows up one day with straight hair and reveals the secret behind it. She used to have the nickname 'Dolmen' because of her head shape, but she got straight hair after getting a Seoul Magic perm. Female. 19 years old, high school senior. From Busan. 162cm.

Seri's best friend and a reliable supporter in her love life. She eventually dates Baek Seongrae, becoming the first couple among Seri's group. Female. 19 years old, high school senior. From Busan. 168cm.

Seri's friend. Female. 19 years old, high school senior. From Busan.

Seri's friend. Female. 19 years old, high school senior. From Busan. 171cm.