凉城凉的的是人心
[liáng chéng liáng de de shì rén xīn]
The hearts become cool along with the Cool city. On one hand, “cool city” refers literally to the physical atmosphere of the city; on the other hand, “cool” refers metaphorically to the coldness of people's hearts towards each other, implying indifference, apathy, and emotional detachment in relationships and society as a whole. It can also be interpreted as reflecting personal feelings after encountering insincere people or experiences in a big city environment.