I can upgrade in the last days

The end of the world is coming, after a heavy rain, zombies are rampant on the earth!Song Yan, who came back from rebirth, accidentally obtained the sign-in system, and has been making great progress ever since!When people were afraid of zombies, Song Yan rushed into the crowd of zombies first!When people scrambled for a hot weapon, Song Yan seized the arsenal!When people were stunned, Song Yan had already become a legend!

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