笑容很多无一快乐
[xiào róng hĕn duō wú yī kuài lè]
'Smiles without happiness' expresses that sometimes we smile just as habitual gestures, which do not reflect true moods. There's an emotional disparity here between what people show outwardly versus internally feel. Such individuals may face difficulties accepting or expressing sadness or disappointment, instead resorting to seemingly positive expressions (smile) to conceal actual unhappiness within.