Traveling Back to Earth, I Inherit the Fantasy World Heritage

Li Yan was an ordinary person living on earth. One day, after he was hit by a truck while trying to save a little girl crossing the road, he accidentally traveled to a fantasy world. After many hardships in the fantasy world, he finally became the first person in the world. However, because the path to immortality was cut off, he could not break through the realm. He died peacefully after his life span reached 20,000 years. I originally thought I would go to the underworld after death, but I actually traveled back in time to the day after saving people on Earth, and brought back the small world of inheritance that I originally planned to leave to the destined people.