One day on Blue Star, a mysterious signal that could not be deciphered was received simultaneously all over the world. Governments around the world are helpless and in panic. The protagonist Ye Chen, a talented linguist and cryptography expert, discovered a certain "law" hidden in the signal by chance and successfully deciphered a small section of it. This piece of information reveals an astonishing fact: the signal comes from a highly developed alien civilization. They are not invaders, but "Earth civilization observers" who have been secretly observing humans at the edge of the solar system for thousands of years.
Ye Chen's deciphering ability attracted the attention of observers, who contacted him in a more direct way and granted him a "mind link device" that can translate all cosmic languages in real time. Ye Chen became the only communication bridge between humans and observers. He discovered that the observer civilization possesses technology and philosophy beyond human imagination. Their observations are not selfless. They seem to be waiting for human civilization to reach a certain "threshold" or face some kind of "test."
He uses the limited information and technology provided by observers to help mankind solve problems such as energy crisis and environmental pollution and promote scientific and technological progress. However, he must be careful to avoid over-reliance and avoid leaking the existence of observers to cause global panic or be used by evil forces. As the communication deepened, Ye Chen discovered that the observers were not the only civilization in the universe, and more powerful cosmic forces were approaching Blue Star. The reason why observers exist secretly is because they are also circumventing the restrictions of some kind of "cosmic law" or "advanced civilization alliance".
