Xia Xiaomo is one of the people walking through this ancient city. To be precise, she is more like an animal - a cat that combines agility and laziness. Lin Yiran, with a literary name, is actually a typical engineering man. To be more precise, he is like a plant - a camphor tree that combines beauty and rationality. One is a young white-collar worker in the city, and the other is a rising star in the scientific community. After five years of love and loneliness, their world is finally illuminated by a starry sky.