空城旧梦失心少年凉城古巷失忆少女
[kōng chéng jiù mèng shī xīn shăo nián liáng chéng gŭ xiàng shī yì shăo nǚ]
A poetic expression combining multiple phrases, it conveys an imagery of a forgotten city ('empty city') filled with old memories ('old dream'), heartbroken young man ('heart-lost boy'), and an amnesic girl walking on ancient lanes in a cold city ('cool city'). It could suggest longing for the past and loss.