你曾于笑面跌出泪水
[nĭ céng yú xiào miàn diē chū lèi shuĭ]
'Ni Zeng Yu Xiao Mian Die Chu Lei Shui' can be understood as 'Once you've shed tears through a smile'. A rather poignant expression about smiling on the outside while being emotionally affected by deeper sorrows inside.