A freshman at Yonhee University and a new member of the cheering squad, Theia. She has a bright and energetic personality. Due to her family's financial difficulties, she works multiple part-time jobs to make ends meet. She initially joined the squad for the money, but gradually becomes sincere about the squad and her teammates.

A senior at Yonhee University. The captain of the 51st class of Theia, the Yonhee University cheering squad. He has a strong sense of responsibility and values principles. He loves the cheering squad more than anyone and cares deeply for the members. He develops a crush on Do Hae-yi as they become closer.

A medical student at Yonhee University and a new member of Theia. A popular guy from a wealthy family. He has a confident and proactive personality. He likes Do Hae-yi and shows a consistent, straightforward approach toward her.

Do Hae-yi's best friend. A freshman in the Department of Clothing and Environment at Yonhee University. A new member of Theia. She is lively and sociable, so she has many friends. She plays the role of the mood maker in the cheering squad.

A sophomore at Yonhee University. The training director of Theia. He is very serious about cheering squad activities. He trains his juniors strictly but has a warm heart. He is a senior with excellent physical strength and passion. He likes Choi So-yoon.

A junior at Yonhee University. The vice-captain of Theia. She has a cool and easygoing personality. A core member with excellent leadership and skills. She practically handles the management of the cheering squad. She has a colorful(?) dating life and is involved with several guys from the athletic and band departments. Perhaps because of that, she has quite a few ex-boyfriends. Determined to become the captain since her freshman year after learning there had only been one female captain in history, she remained in the squad even during its worst times.

A sophomore member of Theia. She has a calm and realistic personality. She is quiet and extremely shy. Her MBTI test results show she is 90% introverted. She plays the role of coordinating between seniors and juniors. She is one of the important members of the cheering squad. Her twin sister, Ji-yoon, entered Yonhee's rival school, Hokyung University, and has now joined the Hokyung cheering squad.

A freshman pre-med student. A new member of Theia. Jin Sun-ho's friend and classmate. A model student type who is good at studying. He started lightly at first but gradually becomes serious about cheering squad activities. He is a freshman who feels overtly rustic but possesses a certain purity. He is highly intelligent and was a renowned prodigy in his hometown of Yeongcheon, Gyeongsangbuk-do. He speaks with a dialect. He likes Tae Cho-hee.

The cheering squad of Hokyung University is named Ignis. Lee Ha-jin The captain of the Hokyung University cheering squad, praised as a legendary leader. A fourth-generation chaebol with extraordinary beauty, natural academic talent, and charisma. Choi Ji-yoon So-yoon's twin sister. Although they are identical twins, she has a lively personality, unlike the timid So-yoon.