旧人旧城旧回忆空心空城空回忆
[jiù rén jiù chéng jiù huí yì kōng xīn kōng chéng kōng huí yì]
The phrase roughly translates to 'Old people, old city, old memories, empty heart, empty city, empty memories.' This reflects nostalgia and feelings of emptiness associated with past experiences and people.