At 11:00 PM, "Late Night Radio" starts broadcasting on time. An Jie and Xiao Lu read listener letters and take late-night hotlines—a silent father, a dog waiting at the door, a ray of light in the valley, an unsent love letter, a cross-time-zone goodnight—sixteen nights, sixteen words hidden deep in the heart, gently caught in the sound. This city is big, but there is always a light, a person, waiting for you to go home.