凉了时光荒废少年留下心脏
[liáng le shí guāng huāng fèi shăo nián liú xià xīn zàng]
This name expresses a deep nostalgia and sadness, as it suggests that time has passed (turned 'cool') and youthful days ('young man') have been wasted, but there is an enduring emotional core - 'heart' left behind. It conveys a feeling of lost youth.