In 2030 AD, on an ordinary summer day, the apocalypse came without warning. In just three months, the world became a purgatory. The global population dropped by two-thirds. The surviving humans not only had to face the ubiquitous zombies, but also resisted the attacks of mutated animals and plants. When pain and death have become the main theme of life, how can humans get out of the darkness and win the space to survive?