The deep-space observation base Xinglan suddenly detects an anomalous stardust signal. Observer Lin Wanxing immediately reports it and joins forces with AI engineer Lu Shiyan, data analyst Su Nian, and base commander Gu Yu'an to decipher it. Along the way, they overcome minor challenges such as equipment fluctuations and data irregularities, gradually discovering that the signal was not produced by a natural celestial body but was instead a friendly greeting from an ancient extraterrestrial civilization. They ultimately decode the signal successfully, opening the door to an initial connection between Earth and an alien civilization. With no conflict or violence throughout, the story focuses on the warmth of technology and the joy of exploration.