嘴角挂着微笑心里带着悲伤
[zuĭ jiăo guà zhe wēi xiào xīn lĭ dài zhe bēi shāng]
'A smile hangs on the corner of my mouth while sorrow resides within my heart' illustrates an appearance of positivity masking inner unhappiness, conveying a sense of putting on a brave front