Pyramid Game

New student Seong Su-ji is introduced to a ranking system called the Pyramid Game that chooses class outcasts via secret vote; Su-ji must decide whether to accept her status, or partner with a fellow outcast to topple the game.

Su-ji becomes the target of vicious bullying when she discovers a popular classmate is related to the inventor of the Pyramid Game; a teacher offers to help Su-ji, while a blackmail scheme is revealed; Su-ji shares a resolution with Ja-eun.

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 and Ja-eun continue to search for allies in their quest to eliminate the Pyramid Game; unable to convince their classmates, they look for options outside the school, like hacker Cho Seung-hwa; a bullied girl searches for a way out.

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; game 15 brings an unexpected twist.

A shocking reveal after game 15 disrupts the class rankings, and prompts complaints from students about flaws in the voting app; Ha-rin has a plan to restore order; a savage game of dodgeball works to Ha-rin's advantage.

Su-ji is trapped by Ha-rin's blackmail; she feels bad keeping a secret from Ja-eun; the class goes on a school trip; tension builds until everything explodes in a game of survival.

The students are upset about a violent assault from the class trip; a powerful allyship gives Su-ji hope; Su-ji acts on her plan to take down Ha-rin.

The big day has arrived; issues develop between Su-ji and her friends; a winning move is made against Ha-rin; the public learns about the Pyramid Game; Ha-rin finally contacts Ja-eun.

Su-ji and her classmates make a final attempt to return to normal life and a safer environment; Ha-rin and Ja-eun's history is revealed.