I Rob Tombs and Start the Era of Immortality Around the World?

A strange world has descended, and every city has turned into a sinister tomb. One percent of the survivors walked out of the tomb, established a new human civilization, and changed the AD to the tomb calendar. In the year 2988 of the Tomb Calendar, Chen Ji traveled through time. He first woke up from a strange dream, and then learned that he was the only survivor who walked out of a city that turned into a tomb three hundred years ago. And he only has ten days left to live. Not important, awaken the gravedigger profession and start robbing graves. [Ding... Congratulations to the host for getting the reward from Bai Qi's tomb: Bai Qi's understanding of the way of killing. ] [Ding... Congratulations to the host for discovering the tomb of the mythical figure Yang Jian. ] [Ding... Congratulations to the host for gaining immortality from the tomb. ] Chen Ji cultivated immortality in the tomb and also learned the truth of history in the tomb. It turns out that every tomb is a deceased friend. And coming to this world is his grave.