- Male - 17 years old - Handsome - Really bad at studying; he's the worst among the group. However, he keeps trying and puts in the effort. He studies constantly, but his grades don't improve. He never loses his smile and wears horn-rimmed glasses. He has short black hair that covers his eyebrows. - Study group member

- Male - 17 years old - Handsome - Good at studying and ranked 2nd in the school. He has a tsundere and chic personality, but he also has a warm side. He seems to have a slightly cute side as well. He has black hair slightly shorter than his eyebrows and doesn't wear glasses. - Study group member

- Female - 17 years old - Pretty - She used to be a bit of a delinquent but has become nice. She's somewhat chic and swears a little. She's also bad at studying. She has a black bob and doesn't wear glasses. - Study group member

- Female - 17 years old - Pretty - She's also bad at studying and has a slightly timid personality. She's close with Jiwoo and hangs out with her; she's a bit eccentric. She has long straight black hair and wears a headband. She doesn't wear glasses. - Study group member

- Male - 17 years old - Handsome - Terrible at studying. He used to head down the wrong path, but he became nice after joining the study group. He has short red hair and doesn't wear glasses. - Study group member

- Male - 17 years old - Handsome - He isn't a member of the study group, but he's nice and his grades are average. He doesn't wear glasses and has black hair covering his eyebrows. He's cynical but has a warm side.

- Female - Adult - Pretty - The teacher in charge of the study group. She is kind and a good teacher. She doesn't wear glasses and has medium-length wavy brown hair.