相映成趣

xiāngyìngchéngqù
to set each other off nicely

CEDICT

互相衬托而更添意趣。

重編國語辭典

Entry Composition

1 相映 xiāngyìng to reflect each other; to set each other off; to form a contrast
2 成趣 chéngqù
  1. (literary) to be interesting
  2. to be interesting