Planet Earth, China.
Previously, Haidian District belonged to the forces of the faction called New China established by the former president of the previous China himself. However, half a month ago, things had changed.
Haidian District had fallen into a period of war not only because of the existence of zombies and mutant beasts or any other race but because of the appearance of a new faction, things had gotten out of control for New China. In just two days' time, two of New China's bases had been taken down and taken over by force by a group of people who were part of the Transcendent faction; a faction they had never heard of, which was only natural considering they had formed in a different district.
However, the real war broke out exactly 12 days ago.