: Gwi-nam, the show's primary bully, murders the principal and targets Cheong-san, leading to a cliffhanger where he throws a knife at Cheong-san's back.

: The students navigate practical survival hurdles, such as building a makeshift bathroom in the broadcasting room. Critical Reception :

: Science teacher Lee Byeong-chan reveals the virus was a desperate attempt to help his son fight back against severe bullying, though it ultimately caused more violence.