旧城已空旧梦已醒
[jiù chéng yĭ kōng jiù mèng yĭ xĭng]
This username suggests nostalgia and letting go. It conveys a sentiment of moving on from past memories ('the old city' symbolizing where memories were made and 'old dreams', referring to former aspirations or experiences which one has awakened or come to realize). It's a phrase expressing reflection on past times while implying that it's time to face reality or move forward.