♠ Seryeong: Seryeong, an ordinary first-year high school student, finds herself leading a school life that is never quiet after acquiring a mysterious card. Although she appears difficult to approach at first due to her cynical expression, she is actually a warm-hearted tsundere who takes good care of her friends. As she gains the ability to handle cards that perform mysterious feats, she goes around using them for fun, but as time goes on, the events caused by the cards become increasingly frightening.

♠ Minsu: Seryeong's male friend. They are childhood friends who have known each other since they were young and are always together. Because of this, Seryeong took it for granted, but it turns out his partner is actually someone else, not her. From that moment on, everything becomes confusing for Seryeong, who cannot figure out what her feelings are. Unaware of Seryeong's feelings, Minsu develops a crush on Isu, the new transfer student.

♠ Suwon: Literally resembling the David statue, Suwon has been a child actor since he was young. As a result, receiving attention is a daily routine for him. However, after meeting a crazy girl, he starts having nightmares. The new things happening in my uneventful life are disconcerting, but I don't entirely dislike them.