破镜怎重圆
[pò jìng zĕn zhòng yuán]
'How does a broken mirror become whole again?' is a rhetorical question derived from a Chinese idiom '破镜重圆 (pò jìng chóng yuán)', used when something that was perfect or pure, especially relationships like marriages or friendships, cannot be restored after breaking apart, much like a shattered mirror can never perfectly mend back into its original state.