After the latest Pyramid Game vote, Su-ji and Ja-eun improve their class rankings. Ja-eun tries to protect the newest outcast, while Su-ji feels it's not her business to intervene. Su-ji finds out she had help behind the scenes.

Su-ji finds trouble when a classmate reaches a breaking point on parent visitation day. Ha-rin sends a warning when Su-ji loses Ha-rin's vote. Su-ji's plans gradually fall apart thanks to a friend's betrayal. The 15th game brings an unexpected twist.