太阳再暖也不暖人心
[tài yáng zài nuăn yĕ bù nuăn rén xīn]
Literal translation: No matter how warm the sunshine is, it fails to make one's mind feel warm as well. Metaphorically, this username reveals that no amount of external comfort (even the sun's warmth) can heal inner pain or emptiness, emphasizing deep sorrow inside.