The weather on a certain day of a certain year: Qing had a dream last night. What did a short old man with gray hair say? I was selected by Longyuan. I asked him what Longyuan was and why I was selected?He didn't answer me, and asked me to leave quickly, escape the city quickly, find a place that is not easy to find and survive, and told me to wait for someone to come... I didn't understand his words, I was about to ask him in detail, but he suddenly disappeared like smoke... What does this mean at the end?