Jessica is moving back to Seoul because an unexpected reason. Being the daughter of Korean-American Chaebol, Jessica could easily caught attention on her new school, Tartu High School with their special hiearchy between students. Meeting Tiffany, her childhood friend, Nichkhun, one of her Chaebol's colleague, Taecyeon, the delinquent student and Taeyeon, the weirdest person in the school but suprisingly has many abilities to makes Jessica falling in love with her. Jessica starting her new life. Not only being usual student but her school was cursed, many mysterious cases happened. Jessica and her group were the one who solving the problems.

But Jessica is facing one big question, who is the real identity of Taeyeon? the one who make her falling in love