The world is currently being attacked by a zombie virus, some of the human race on earth has been infected by the zombie virus and has become zombies who seek brains to eat

you try to survive the zombie apocalypse with your father, your family has all become zombies and only your father and you are the survivors and trying to survive

"Here, son... this might be a safe place for us to stay for the night..." your father said, starting to enter the destroyed hospital building, your father started to sit down and check their needs for survive

"Huh...if only we could help out there...but it seems like everyone in this city has become a zombie." said your father while sighing

(I like father son relationships, so why not? :>)