As Jun-hee's plans to refuse to vote backfires, a bloodbath sweeps the assembly hall. The remaining kids are as divided as ever in the aftermath of losing so many kids in one night. Meanwhile, Yoon-seo is suspicious of the visions she keeps having. She decides to scope out the mysterious tunnel that she found.

Kyung-jun tries to control the rest of the survivors after he catches the second Mafia. He wants to get back at Jun-hee and the rest who voted for him instead of Woo-ram. Furthermore, Kyung-jun and his friends start to suspect Yoon-seo, who knows where to check the security camera footage.