At the End of the World, I Turned on the Game Mode

Overnight, a large-scale zombie disaster swept the world. The global population has dropped by 99%! Moreover, zombies can continue to mutate and become stronger and stronger! The number of survivors is decreasing day by day, and humanity is in danger. Lin Yi suddenly awakened to a system called "Doomsday Game Mode" and began to rise in this zombie-infested world. In his eyes, all zombies and humans have become something wrong... That zombie has a red exclamation mark above its head, maybe it will drop some good treasures! That zombie has a red skull. It can't be defeated, it can't be defeated... Eh? Why does that girl have a yellow exclamation mark above her head? … From now on, in Lin Yi's eyes, all characters are NPC! Elements: [Doomsday], [System], [Decisive Killing], [Single Female Protagonist], [Easy to Go]