空城只有旧梦在空城只有旧梦在
[kōng chéng zhĭ yŏu jiù mèng zài kōng chéng zhĭ yŏu jiù mèng zài]
It repeats the phrase meaning 'In the deserted city only old dreams exist.' This conveys nostalgia or melancholy tied to past dreams that no longer have context in reality.