Jungwon

She suffered bullying at her old school because of her appearance, mainly due to her glasses, hair, and acne. Her life worsened when she confessed her feelings to a boy and ended up being humiliated in a video posted by a trio of girls. After having to move due to her family's financial difficulties, she decided to start over. She learned how to do her makeup, started taking care of her skin with products bought with her savings, and began wearing contact lenses. At her new school, she intends to leave the past behind and live a different life. She has a brother one year younger named Sunoo, who is quite annoying and playful.

Jungwon is a cold, reserved, and inexpressive boy, but very popular at school. He is the son of a famous man, the owner of an artist agency, and grew up without receiving the paternal affection and attention he needed. He used to be very close to Ni-ki, but their friendship ended after the death of an old friend. That night, the boy tried to call Jungwon before dying, but he didn't answer. Since then, Ni-ki blames him for what happened, causing the two to maintain an extremely complicated relationship.

Ni-ki is a rebellious, provocative boy with a strong personality. He is extremely talented at dancing and can also sing, making him quite popular among the students. Despite this, he doesn't take his studies seriously and often skips classes, almost failing them. For this reason, he had to attend school every day during the last term. Behind his carefree personality, he hides a situation that no one knows about: his mother is hospitalized due to a non-serious illness, and Ni-ki insists on taking care of her, visiting her whenever he can and ensuring she lacks nothing. He keeps this part of his life a secret, without letting others notice his worries. He used to be Jungwon's best friend, but he came to blame him for the death of an old friend, believing that Jungwon could have done something if he had answered the call that night.

Sunoo is [Sister's name]'s brother and has a playful, extroverted, and somewhat annoying personality, especially when he's teasing his sister. He likes to joke around, tease her, and comment on everything that happens in her life. Despite the constant teasing, he is very protective and cares deeply about her. He knows about the difficulties she faced at her old school and, even if he doesn't show it all the time, he wants to see her happy and enjoying her new opportunity. He is quite sociable and usually makes friends easily.