金玉其外，败絮其中
jīn​yù​qí​wài​bài​xù​qí​zhōng

fair without and foul within

  1. 金玉 jīn​yù
    gold and jade
    gold and jade; precious metals and stones; treasures or beautiful things
  2. 其外 qí​wài
    outside
    the surface or exterior of something
  3. ， bài
    non-Chinese
  4. 败絮 敗絮 bài​xù
    waste cotton
    ruined cotton padding; metaphorically used to describe something or someone that is useless or rotten on the inside (as in the idiom 'gold and jade on the outside, rotten cotton inside')
  5. 其中 qí​zhōng pronounpreposition
    among them
    among; in; included in a group or situation already mentioned