In the year 2019 scientist discovered a deadly virus in china when some native ate bats, they named it corona virus or people call in the Covid19 virus this virus can affect you by the air near an infectee, sneezing, saliva etc. Shortly after that the disease spread all over china and the whole world because of an infected tourist who snuck in the plane. Few months after the virus spread for some reason after many infectee died they came back to life with rotten and deformed bodies.
The corona disappeared but this new virus is much more scarier than the previous one.
The peoples who came back to life is seeking for humans bite, if you get bitten by one you'll die and become one of them.
Few years later...
Hi, I'm Riven the only human who was left on earth.
We tried to fought trying to save humanity but we couldn't do it. The virus is too strong.
River breathi heavily lying in the ground with severed limbs and bite marks all over his body.
Riven: If only i could go back to the past....
(Riven diead)
As riven die he saw a faceless man saying I will give you a second chance.
After that riven woke up in a familiar room and he heard a voice calling him saying Brother wake up, you're late for work,
Riven is looked at the calendar and he saw the year January 2019, 2 months before the virus.