空城空梦空人心旧城旧梦旧悲凉
[kōng chéng kōng mèng kōng rén xīn jiù chéng jiù mèng jiù bēi liáng]
'Empty city, empty dream, empty heart; old city, old dream, old sadness.' It reflects a sentiment of emptiness and nostalgia mixed with loneliness and sorrow in familiar surroundings.