南城里旧梦未醒
[nán chéng lĭ jiù mèng wèi xĭng]
It can be understood as 'old dreams have not yet awakened in the Southern city.' The user might want to express their reminiscence of something (perhaps a relationship) in the past in some southern city. There's a lingering attachment to those memories that has not been let go. Chinese literature and culture often use poetic descriptions for nostalgia.