The world has fallen.

The dead roamed the streets, it seems impossible, how is it possible that the dead are walking? They roam mindlessely looking for the flesh of any living creature they could get their hands on. Was is.. Zombies? No.. Impossible. They don't exist, right? A story about two boys whose name is Han Jisung and Lee Minho who bumped into each other accidentally in this dangerous world. Will they help each other survive?