Suhyeok, Onjo, Minji, Hari, Daesu and Hyorung being the only survivors students of Hyosan High School. This squad continue living in Hyosan after meeting Namra a humbie in their school rooftop this squad discover that Cheongsan is still alive and he turn just like Namra a humbie and not only they found out Cheongsan existence. They all also found out that there still a zombies roaming around in Hyosan. While fighting against the zombies and not coming back in evacuation center. This squad found out something that can cure the infected person. Are this squad the one who can help to stop spreading the virus? or they will just let it go remembering that they're almost die when the soldiers didn't save them instead they just turn them down. And now that Suhyeok knows that Cheongsan didn't turn into an ash after the bombing and they met once again. Will their relationship as a friends will still remain or this friendship will be more than a friends?