日光傾城却溫暖不了人心
[rì guāng qīng chéng què wēn nuăn bù le rén xīn]
'Sunlight Suffuses Yet Can't Warm Hearts' expresses a feeling that although all seems splendid on the surface, inside it's still cold or depressed. Like bright sunshine illuminating the city cannot dissolve inner melancholy. This may refer to those suffering mental struggles despite living what might be considered good lives.