"All Of Us Are Dead"|Season 1|Episode 9

Gwi-nam reaches the rooftop and attacks Cheong-san before Nam-ra throws Gwi-nam off the roof. After Jae-ik's group are taken to the quarantine camp, Jae-ik reveals during the interrogation about Byeong-chan's laptop. The military thus send a helicopter to Hyosan High, where the troops successfully takes the laptop from the school and is about to evacuate the surviving students. However, they receive last-minute mandatory orders to treat any survivors as asymptomatic and abandon them, due to a simultaneous on-camp incident where Eun-ji suddenly turned aggressive and bit Chul-soo. The soldiers reluctantly leave the rooftop survivors behind, much to their mutual distress. The soldiers and scientists study both Eun-ji and Staff Sergeant Lee Jae-joon, a fully-zombified soldier, and decides to further quarantine the evacuated Hyosan survivors. In Hyosan, it begins to rain and thunder, which impairs the zombies' hearing and vision. Both the rooftop survivors and the restroom survivors notice the zombies' weakness and thus, both groups attempt to make use of it to escape. The rooftop survivors escape and reach the ground floor first and enter the parking lot. Cheong-san is shocked to see his mother, who is now a zombie, standing in front of him behind a truck.