In 2031, the biochemical virus "HGB" studied at the chemical base in City A was leaked. The virus started in City C and spread rapidly around the world. In less than two years, the world has become the end of the world...
People's hearts are evil in the apocalypse, and the people behind them are more dangerous than the zombies in front of them.
(This article may have big logical bugs, so let's just go with it)
Motto: People's hearts are evil, don't leave your back to others easily