看起来像百毒不侵其实早已百毒侵身
[kàn qĭ lái xiàng băi dú bù qīn qí shí zăo yĭ băi dú qīn shēn]
'Seems impervious to all poisons, yet they've secretly seeped deep into my body.' Portrays appearing strong externally while actually enduring much inner pain, reflecting hidden emotional suffering.