I Can Level up in the Last Days

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