心笑久了会痛
[xīn xiào jiŭ le huì tòng]
'Heart Will Hurt After Laughing Long Enough'. The expression captures a deep emotional irony where outwardly laughter hides inward sorrow. Despite seemingly laughing all the time (possibly pretending to keep spirits up around others), over time such pretense actually contributes to one’s inner sadness rather than joy. Thus, prolonged false happiness ends up causing pain eventually.