烟花易冷人心易凉
[yān huā yì lĕng rén xīn yì liáng]
'Fireworks Quickly Cool, Human Hearts Easily Grow Cold' reflects how transient beauty fades away fast like fleeting sparks from fireworks while reminding us human affections change rapidly sometimes leading to indifference. It conveys the impermanence of warmth both physical and emotional.