孤城旧梦
[gū chéng jiù mèng]
'Solitary City - Old Dreams' creates a vivid image with strong literary color. It conveys nostalgia while also evoking solitude and melancholy. Possibly it symbolizes someone feeling nostalgic about his old memories or having unfulfilled past dreams or a sense of being isolated from surroundings (in a bustling place, still feeling loneliness inside).