华灯绯伤凉薄人
[huá dēng fēi shāng liáng bó rén]
This username paints a picture of a cold-hearted person ('凉薄人' means 'unfeeling/callous person') who stands amidst bright lights ('华灯' can be understood as luxurious lighting scenes often found in big cities) while feeling emotional scars or pain deep inside ('绯伤' suggests being emotionally hurt).