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I'm back again and starting to revise the previous chapters. Basically planning to rewrite...

Have you ever thought that the unknown neighbor who lives next door to you is doing amazing things? The earth received signals from outer space. After humans decrypted them, they found that they were latitude and longitude one by one. Human beings searched according to the guidance and discovered underground cities. In the underground cities, there are technology trees left by aliens and time and space gates connecting alien planets. There is a group of people who go to strange planets through the gate of time and space in order to light up the technology tree. But at the same time, the opening of the gate of time and space means that there is a shortcut to the earth. Therefore, while this group of people are pioneering bravely, they are also responsible for guarding the earth's defense line. They mockingly call themselves: watchdogs. To every ordinary person who makes progress silently and pays.