微笑扯痛嘴角眼泪划破脸颊
[wēi xiào chĕ tòng zuĭ jiăo yăn lèi huà pò liăn jiá]
Meaning 'Smiling painfully while tears streak down my face'. It signifies experiencing a mixed torrent of sadness, frustration, yet trying to remain brave on the outside, indicating a situation where one struggles to show happiness despite underlying turmoil.