心疼到爆也要强作欢笑
[xīn téng dào bào yĕ yào qiáng zuò huān xiào]
This Chinese username 'Xin teng dao bao ye yao qiang zuo huan xiao' roughly translates as 'Heartbroken to extreme, yet forced to show happiness.' It conveys that someone has undergone tremendous mental suffering or distress and they have been hiding it with pretended laughter and joy. The pain might come from heartbreak after a break-up or some kind of loss.