北海南城旧人心南海北城旧人爱
[bĕi hăi nán chéng jiù rén xīn nán hăi bĕi chéng jiù rén ài]
Old heart from the south of the northern sea and old love from the north of the southern sea. It expresses nostalgia for places and people of the past with rich emotion, possibly evoking a story of a past love spanning different locations.