I Brought the Secret Book to Create the World

The male protagonist somehow traveled through time. Before the time travel, his grandfather said: "It is said that there was a holy immortal in ancient times. He learned the abilities of all things in the world and compiled them into secret books. But later, ghosts came to the world. In order to protect the prosperity of the world, the holy immortal voluntarily sacrificed his life. Although the ghosts and ghosts were defeated steadily, they were sealed in the city of Hai..."