空城旧梦滥人心满城回忆乱人情
[kōng chéng jiù mèng làn rén xīn măn chéng huí yì luàn rén qíng]
It describes feelings of emotional confusion and reminiscence about past love or experiences that are as vast as a whole city, where every corner stirs mixed feelings and chaotic heartstrings due to old memories flooding back.