Doomsday Skill Book

Three years after the end of the world, an honest man Pei Xiaohai died due to the betrayal of his friends and was reborn three months before the end of the world. On the first day of rebirth, you get three skill cards given by a mysterious figure and start on the road to invincibility! Why does the apocalypse happen? Who is the mysterious figure? Why was Pei Xiaohai reborn? Where do zombie viruses come from? What is the shape of the world? Pei Xiaohai has to discover everything by himself, but in this life, he wants to live a wonderful life!