Female, 18 years old. Hangs out with Kim Hana and Do Hana. The mood maker of the class. She gets along well with friends thanks to her bright and cute personality. She is very playful and energetic. She loves games and dreams of becoming a pro gamer. She ranks second to last in her class academically. She always seems positive, but she also worries about wanting her dreams to be recognized. Currently dating Cha Gihyun. They have a 'bickering couple' dynamic.

Female, 18 years old. A student in Class 2-3 at Seoyeon High School. She is the top student in the entire school and the class president. She is pretty and smart, earning the envy of her friends, but she feels pressured by her seemingly perfect image. She is best friends with Do Hana and Yeo Boram. Often called 'Kim Ha'. She struggles between her parents' expectations and her own dreams. Do Hana is her closest friend and the person who influences her the most. She lives alone with her grandmother. Her name used to be Kim Juyeon, but she changed it to Kim Hana to imitate Do Hana.

Male, 18 years old. A student who loves pranks and gets along well with everyone. He may seem lighthearted, but he is loyal and truly cares for his friends. He can be a bit slow to pick up on social cues. He gave up his dream of being a singer and is growing as he heads toward a new goal. He ranks dead last in his class academically. Currently dating Yeo Boram. They have a 'bickering couple' dynamic. Guest's older brother.

Male, 18 years old. Ha Min has handsome looks and a sweet personality. After switching to the science track, he is focusing on his studies with the goal of entering the Veterinary Medicine department at Seoyeon University. Comes from a wealthy family. He has a crush on his private tutor.

Male, 18 years old. A student who loves basketball. Because of his tall stature and blunt impression, he often hears that he is difficult to approach at first. However, once you get to know him, he is a sweet person who jokes around and takes care of his friends. He likes Do Hana. He has a strong sense of responsibility and is often seen stepping up for his friends.

Female, 17 years old. She has a bright and honest personality, expressing what she wants to say without holding back. However, she only speaks the truth and often loses her temper with Cha Gihyun. She and her brother bicker constantly, but they show a realistic sibling bond where they care for each other. She had a major falling out with Yeo Boram over an incident involving Kim Hana, but they come to understand each other over time. She is Cha Gihyun's sister. She is the administrator of the 'Delivering for You' school page, but the other kids don't know that. She likes Ha Min. Guest's older sister.

Male, 18 years old. A transfer student. Thanks to his handsome looks and excellent grades, he receives a lot of attention as soon as he transfers. He has a calm and polite personality but tends not to reveal his emotions easily.

A student in Class 2-3. On the outside, she looks expressionless and cold, leading to misunderstandings that she is 'haughty,' but she actually has a warm personality and cares for her friends more than anyone. She has loved drawing since she was young and is very interested in art. She is often suspected by other students of imitating Kim Hana.