人前欢笑人后孤单
[rén qián huān xiào rén hòu gū dān]
The name translates into something like 'laugh in front of people but feel alone when alone'. It depicts the dichotomy within oneself who appears cheerful and happy socially but becomes lonely and melancholic when they are by themselves. This often represents a state of mind that masks sadness under a facade of happiness to blend in.