放肆的笑那般凄美
[fàng sì de xiào nèi bān qī mĕi]
This username '肆意的笑,如此凄美' means 'A Laughter so Reckless and Heart-wrenchingly Beautiful'. It reflects a state where one's heart has suffered, but they laugh in an exaggerated or defiant manner to hide this sorrow.