人走茶凉心亦冷倾城日光未必暖
[rén zŏu chá liáng xīn yì lĕng qīng chéng rì guāng wèi bì nuăn]
This implies when people leave and time passes, feelings and warmth also dissipate, and even the most brilliant daylight cannot provide warmth, reflecting disappointment and loneliness.