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One day, Ye Kong suddenly received an email with the following content. Do you want to know about the tourist attraction underground city? Located in the hinterland of the desert, along the way you can enjoy the magnificent scene of the solitary smoke in the desert and the setting sun over the long river. It took fourteen years to build and has the most complete modern facilities. There are hundreds of acres of farmland in the city, where vegetables and fruits are continuously supplied all year round, and you can experience the joy of planting and harvesting first-hand. The city is equipped with intelligent service robots, determined to provide the highest quality humanized services. With full wireless network coverage, you can blind your friends even if you are underground. Best of all, it's all free, no fees! Action is worse than excitement, come and join our three-day dungeon tour! Ye Kong: "?? The conditions are so good? Give me one too!" (None of the above descriptions will appear in the text. There are tens of millions of pyramid schemes, but there are really only a few. I can't sign up, so I shed tears.)