北城爱人南城旧人
[bĕi chéng ài rén nán chéng jiù rén]
Translating as 'Northern City Lover, Southern City Ex', it describes a contrast or duality in love experiences—new lovers are cherished, and former lovers from the past live on in one’s heart like memories. It might reflect on moving forward with new loves while keeping old loves as precious memories. The North-South dichotomy could symbolize distance or transition between different phases of relationship and life.