Lin Che, a talented voice actor, had his voice become hoarse after a major illness, and his career hit rock bottom. By a twist of fate, he participated in the recording of the documentary "Light in the Sound", walked into a special education school, and met Shi Yan, a mute and visually impaired teenager. Lin Che gradually came to realize that the value of sound does not lie in a perfect timbre, but in conveying warmth. He launched a sound relay activity, uniting ordinary people such as Zhou Xiaoman, a broadcasting major student, and Sister Wu, an assembly line worker, to gather all kinds of imperfect sounds together. In the process of passing on sound, Lin Che walked out of his inner predicament, allowing every ordinary sound to bloom with its own light.