He Comes from Out of Bounds

The future world will be seriously polluted. A strange virus called "Gray Butterfly" has swept the world. Infected people, except for the stomach and heart, all other parts turn gray, and they can only survive by sucking human blood. Human existence is imprisoned in the last colored territory in the world - the "Bright World". Until people discovered infected but still normal humans outside the world... Cyber technology + superpower chip + strange pollution + escape from the apocalypse (buffs are stacking...)