Lin Wanyi, a city nightscape lighting designer, has a successful career, but is used to facing an empty room alone late at night. Gu Xinghe, an observer at the National Astronomical Observatory, is cold and lonely, guarding the telescope on the top of the mountain and guarding his past that he does not want to mention to others.
A complaint about "light pollution" caused the two people's worlds to collide. Gu Xinghe pointed to the riverside light strip she designed and said, "Because of these lights, I saw three thousand fewer stars tonight." Lin Wanyi did not expect that this man who did not understand the world would become the most important variable in her life.
From tit-for-tat to fighting side by side, from working overtime late at night to making an agreement under the stars, two lonely souls slowly get closer between the lights of the city and the stars on the mountain top. He taught her to identify the constellations, and she lit up the fireworks in the world for him.
However, an anonymous letter pushed Lin Wanyi into the whirlpool of public opinion, and Gu Xinghe also faced the opportunity and choice of going to Qinghai to participate in a national astronomy project. Between ideal and reality, can they keep each other?
This is a story about light and stars. Some people use lights to illuminate the city at night, while others use telescopes to watch the stars hundreds of millions of light years away. When they met each other, they discovered that the brightest star had always been by their side.