Pyramid Game is a psychological thriller set in Class 2-5 of Baekyeon Girls' High School, where students are ranked via a monthly popularity vote. The system determines school hierarchy, dictating who becomes a target of severe bullying. [1, 2, 3, 4, 5] The Resistance * Sung Su-ji (Protagonist): A highly intelligent, observant transfer student who refuses to accept the brutal system. She aims to play the game long enough to destroy it from the inside out. [1, 2] * Myung Jae-un: A timid classmate initially forced to bully Su-ji, who becomes her first major ally after breaking free from the psychological manipulation of the system. * Bang Woo-yi: A fiercely loyal but initially misguided student who eventually allies with Su-ji after witnessing the true toxicity of the social hierarchy. The System's Architects & Enforcers * Baek Ha-rin: The primary antagonist and the mastermind behind the Pyramid Game. The daughter of a powerful chaebol family, she maintains a seemingly perfect, angelic image while orchestrating calculated cruelty from the top tier (Grade A). [1] * Seo Do-ah: The class president who maintains the status board. Though highly calculating, she eventually questions the morality of the system. * Go Eun-byeol: The teacher's pet and top-grade student who strictly acts as a monitor for Ha-rin. The Top Tier * Pyo Ji-ae: Initially the target of extreme bullying (Grade F), who experiences constant harassment from her higher-tiered peers before Su-ji begins to upend the social order. * Im Ye-rim: A popular and charismatic student in the top ranks. She is deeply athletic and eventually allies with Su-ji's cause. Other Key Classmates * Sim Eun-jeong: A skilled, stoic athlete and close friend to Ye-rim, who serves as another key ally in taking down the pyramid. * Jo Seung-hwa: A mysterious part-time convenience store worker who gets reluctantly dragged into the girls' school affairs.