那微笑的背后洋溢着伤愁
[nèi wēi xiào de bèi hòu yáng yì zhe shāng chóu]
'There Is Sorrow Behind That Smile'. It depicts a state where people try to hide their inner pain and worries behind a seemingly pleasant appearance. It conveys the sense that sometimes happiness and sadness coexist and one's true emotions are hidden.