A new and formidable virus ravaged the Earth, exacting a heavy toll on humanity. It took a full five years to finally overcome it. During this period, many cities implemented military control for easier management and to curb the virus's spread as much as possible. Now, five years later, humanity has finally developed a vaccine. The gates of Xinnan City's temporary base are opening, and the citizens are about to return to the outside world—to the city they abandoned for five long years...