以朋友名义一脸笑容
[yĭ péng yŏu míng yì yī liăn xiào róng]
It translates to 'with the name of friend (status), with smiles.' Here, it can refer to a person who maintains the appearance of friendly relations and always smiling while concealing his or her true feelings which might not be happiness but rather sadness or other more complicated emotions.