北城向凉南城暖南城日落北城恋
[bĕi chéng xiàng liáng nán chéng nuăn nán chéng rì luò bĕi chéng liàn]
The phrase contrasts the coldness in the northern city and the warmth in the southern city. 'South City Sunset, North City Love' means love in the north while warmth is felt in the south, reflecting contrasting emotions of the person’s love life.