Pyramid Game

The Birth of a Trio (1x3)

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Soo-ji moves up to Grade C, and the treatment she gets changed completely overnight. She breaks the promise she made with Ja-eun, but she decides to join hands with her and help the new girl in Grade F, Pyo Ji-ae. Soo-ji, Ja-eun, and Ji-ae come up with a plan to destroy the pyramid altogether.