Chaehwa Girls’ High School in Gangnam is where Korea’s 1% elite girls attend. Woo Seul-gi, a top-ranked student from a provincial orphanage, transfers here and must maintain her number one rank to escape her harsh reality at all costs.
On her first day, a reigning elite student, Yoo Je-i, approaches Seul-gi, and they become best friends. What starts as simple curiosity evolves into something more intense as Je-i's familiarity with Seul-gi’s past comes to light.
As the girls grow closer, Je-i’s hidden side surfaces, and the pressures of competitive exams drive them both toward madness. Can their rivalry stay friendly, or will it turn brutally bloody?