The original story is quite old-fashioned.
The protagonist, Chen Ran, is reborn. In his previous life, he experienced the beginning of the apocalypse. Because he didn't awaken any superpowers, he was looked down on and excluded in a world where only the strong could survive.
Even though he endured three years of hardship, he eventually died in an accident during a zombie attack at the start of year four.
But just as he was dying, the crescent-shaped jade pendant hanging around his neck, an heirloom, suddenly lit up with a dazzling white light as it absorbed his blood.
When he woke up again, Chen Ran was shocked to find that not only was he not dead, he had actually returned to a full month before the apocalypse began.
His first thought was that everything had been a dream. But soon he realized the jade pendant around his neck had disappeared, and in its place, he now had a strange space in his sea of consciousness.