北巷凉人心南城空旧忆
[bĕi xiàng liáng rén xīn nán chéng kōng jiù yì]
Translated as 'The north alley chills one's heart while old memories linger in the south city,' it evokes a feeling of sadness and nostalgia. The northern alley may symbolize coldness or a difficult period in life, while the southern city represents past happy memories that now seem distant.