History: What If Cultivation Were Truly Possible?

Ming You, a history enthusiast, died by accident while saving someone. After King Yama verified that he was the reincarnation of a man who had done good deeds for a hundred lifetimes, Ming You began serving as the guardian of the river of time. At the same time, sky screens appeared above every historical era. From that day on, a craze for cultivating immortality swept the world.