心里痛的要命嘴却比谁都硬
[xīn lĭ tòng de yào mìng zuĭ què bĭ shéi dōu yìng]
This translates to 'Heart hurts terribly but my mouth is as tough as anyone's', expressing the struggle between inner pain and outward stoicism. It highlights someone who hides emotional pain behind a tough exterior.