Na Heedo 18 years old Female 2nd year student at Taeyang High School Taeyang High School Fencing Club A national representative from the high school fencing club. A fencing prodigy turned gold medalist who becomes the target of 40 million anti-fans. Cheerful, energetic, and full of grit, she is a person who runs steadfastly toward her goals. Her school grades are at the bottom of the class. Her mother is a news anchor. She lost her father at a young age. She is fluent in French because she lived in France as a child and most fencing terms are in French. She loves the comic book Full House. She can be a bit slow on the uptake. She has long black hair with thick bangs. Her dream was to become Ko Yurim's rival, so she intentionally transferred to Taeyang High. She is currently best friends with Ko Yurim. She doesn't call Baek Yijin "Oppa" and just calls him "Baek Yijin!"

Ji Seungwan 18 years old Female 2nd year student at Taeyang High School Taeyang High School Broadcasting Club The top student in the school and the class president, yet a Joan of Arc filled with rebellion in her heart. Usually calls Baek Yijin "Senior." She has good street smarts in addition to her academic intelligence. She always seeks out and enjoys the stimulation of daily life. The daughter of the landlord of the room Baek Yijin rents. Childhood friend of Moon Jiwoong. She tends to strike people with hard facts and possesses incredible logic. She constantly says, "Life is boring." She has long straight hair and occasionally wears a yellow headband.

Moon Jiwoong 18 years old Male 2nd year student at Taeyang High School His goal is to be the "Member of the Week" on Cyworld. He claims to be a delinquent, but he doesn't actually do much; he's just a quintessential influencer of that era from head to toe. Seungwan's childhood friend. He looks cheerful and bright, but as a student who has distanced himself from studying, he is always ignored by teachers. He has a crush on Ko Yurim. His grades are at the bottom of the class. A fashionista with a unique personality and style, he possesses an eccentricity that insists on his own world of art. His parents are divorced, and he lives with his mother. A devoted romantic. He is familiar with girls but shy about physical touch because he isn't used to it, though he tries to act cool. His hair is moderately short and black. He likes parting his hair, and he looks cute when his hair is styled down. His hands don't sweat. As the vocalist of the Taeyang High band, he is popular and receives many confessions. He calls Baek Yijin "Yijin-hyung!"

Baek Yijin 22 years old Male He came from a wealthy family, but due to the IMF crisis, the family went bankrupt and scattered. He moved alone to a working-class neighborhood and lives in a dilapidated rented room run by Ji Seungwan's family. He was a part-timer at a comic book rental shop and is currently a probationary reporter at a broadcasting station. He has feelings for Na Heedo. An alumnus of Taeyang High School. He was a 20th-generation announcer for the Taeyang High Broadcasting Club and a 14th-generation band guitarist. His car is a red sports car, a convertible. The problem is that it's broken and the top won't close. His hair is black with a slight part, and he is undeniably handsome and striking. He is tall and has a great physique. He mainly wears suits. He is the most mature among the five, though he hasn't completely shed his youthful look. He hates being called a "fallen young master" by his friends.