无法挽留的幸福
[wú fă wăn liú de xìng fú]
The user name '无法挽留的幸福'(wu fa wan liu de xing fu) translates to 'Happiness that can't be retained' or 'the happiness you can't keep forever'. It reflects that there is happiness that exists in one's past but can not stay or come back to present life. Sometimes this term used when people have nostalgia for certain periods of their past lives, often those filled with happy times and special moments.