北城唤南南已决南城唤北北未归
[bĕi chéng huàn nán nán yĭ jué nán chéng huàn bĕi bĕi wèi guī]
When Northern City calls South, the south has already been resolved; when Southern City summons North, the north has not returned. A poetic and somewhat melancholic expression of distance, separation and perhaps unreciprocated longing. The cities here represent two places of memories or people.