Keep Your Face

If the way out for civilization lies in technology, then technology is the end of civilization (if I want to write only hard science fiction) One day, the appearance of a signal shocked China's Dark Matter Observation Department. After joint decryption by multiple secret-related departments, it was found that it was an invitation to cooperate from the Cunyan civilization... However, what was decrypted in the United States on the other side of the ocean was completely different news. Let's see how humans will treat these astonishing signals, and how they will find their own shadow in the mysterious dark forest... This complex world spanning time and space will be refreshing for you. (The introduction should be changed, and I will rewrite it as a qwq later)