Apocalypse: Bloodthirsty Demon Doctor

The pale world, the leaked virus, the bloodthirsty demons, the wandering hunters, how to save the world in danger? In times of crisis, should we "team up to fight monsters" or be "individual heroes"? Faced with the strange virus that spreads to the world, the infected people all turn into terrifying creatures. It depends on whether the protagonist group will "annihilate" the enemy or be killed by the blood demon, whether it will reshape the order of the world, or evolve into a human purgatory...