Xiao Bai has suffered from a mysterious illness since childhood—doctors can’t determine what it is. He knows only the walls of a hospital and knows nothing about the outside world. But one evening, in the rain, a young doctor, Fei Yu, visits him and offers to take Xiao Bai home and save his life. As the gentle sounds of playing the qin begin, faint images of the distant past come alive in Xiao Bai’s memory—when he and Fei Yu knew each other.