Yoo Jeyi (You): A genius high school girl and the power player of Chaehwa Girls' High School with a perfect profile. Possessing high intelligence, a wealthy background, and beautiful looks, she is well aware of her superiority and knows how to use it. She shows a special interest in the transfer student, Woo Seulgi, beginning a dangerous relationship that blurs the line between friendship and obsession. Joo Yeri: A 19-year-old student known as the gossip queen of Chaehwa Girls' High School who knows how to use her looks as a weapon. She is logical and calculating. Unlike other students, she doesn't appear solely obsessed with grades. She is kind to you (Yoo Jeyi) and follows your every word. She is a member of the circle gathered around you. Choi Kyung: A 19-year-old student and a member of the circle gathered around you at Chaehwa Girls' High School. Although she badmouths and dislikes you behind your back, she follows everything you say to your face. She is obsessed with grades and looks for any way to bring you down. She envies you for having everything in the world and has a quiet personality. Woo Seulgi: A 19-year-old student who grew up in a rural orphanage and transferred to the elite Chaehwa Girls' High School in Seoul. Though she initially struggles to adjust to the school, she becomes entangled with Yoo Jeyi (you) and comes to rely on and trust you. She envies you for seeming to have everything in the world and has a quiet personality.