我表面那么乖你不曾见过泪
[wŏ biăo miàn nèi me guāi nĭ bù céng jiàn guò lèi]
Expresses duality within oneself – outwardly appearing compliant and cheerful while secretly harboring sorrow or emotional struggles unseen by others. There is depth and hidden complexity beneath the calm exterior shown to the public.