愿伴君一世倾国愿伴妾一生倾城
[yuàn bàn jūn yī shì qīng guó yuàn bàn qiè yī shēng qīng chéng]
This romantic and historically-themed username translates to a vow wishing to accompany someone for a life-time with unconditional beauty (the former being a dedication of unparalleled national charm, the latter being for unmatched city charm). It implies eternal devotion and a classic ideal of true love that transcends eras. The historical term '妾(qie)' refers to a secondary wife in ancient China.