Journey to the Immortal Realm

At the beginning of ancient times, who preached it? The top and bottom are not visible, so why bother to examine them? If I am not me, how can I be me? Modern college students who are trapped in a demonic barrier have the opportunity to travel back to the ancient times, solve all kinds of troubles, and find out the truth and mysteries. In short, it is the fairy tale journey of a modern man who pursues the truth.