旧人离旧城空
[jiù rén lí jiù chéng kōng]
This nickname literally translates into 'Former people leave, old city becomes empty'. This name probably conveys a feeling of nostalgia. Maybe this person had a lot of precious memories associated with a past location and its inhabitants, yet these people and places are all gone. It may hint at loneliness, yearning, melancholy and attachment towards the past.