笑中笑着笑不出的笑
[xiào zhōng xiào zhe xiào bù chū de xiào]
'Xiao Zhong Xiao Zhao Xiao Bu Chu De Xiao' means 'Laughter That Can’t Erupt in Laughter', implying a forced smile or laugh when one is supposed to be laughing. It highlights inner sorrow disguised as happiness.