悲伤的时候不流泪委屈的时候不诉说
[bēi shāng de shí hòu bù liú lèi wĕi qū de shí hòu bù sù shuō]
This means 'Not crying in times of sorrow; Not complaining in moments of injustice.' This username shows the person's desire to present themselves as someone tough, able to handle difficult situations on their own.