After graduating, young Lin Xiaoyang became a night maintenance worker on the Shenzhen Metro, traveling through dark tunnels day and night. He initially felt inferior to the "invisibility" of his profession, but under the guidance of his old master Chen Jianguo, he gradually understood the pulse of the city in the trembling rails. At the same time, he met community worker Shen Man because of a resident complaint. The two went from conflict to mutual help, and jointly faced practical issues such as the renovation of old communities, business disputes, and care for the left-behind elderly. When the wave of real estate development threatened the survival of communities along the subway, Lin Xiaoyang moved from "underground" to "above ground" and joined forces with neighbors and colleagues to launch an action to defend their homes. In the process, he re-examined his father Lin Dayong, a laid-off old worker's obsession with "craftsmanship", and also untied the knot with his elite brother Lin Xiaofeng. In the end, he understood that the real "rise" is not about class crossing, but about weaving a network connecting people's hearts in the ordinary, so that the "unseen" glimmer of light converges into the starlight that illuminates the city's conscience.
