唱紅臉

唱红脸
chànghóngliǎn
  1. to play the role of the hero (idiom)
  2. to play the good cop

CEDICT

  1. (figurative, idiomatic) to play as the "good cop" in a good cop bad cop tactic; to pacify or appease while having one's partner threatening or punishing the same target
  2. to play as the "good cop" in a good cop bad cop tactic; to pacify or appease while having one's partner threatening or punishing the same target

Wiktionary

Entry Composition

1 唱 chàng
  1. to sing
  2. to call loudly
  3. to chant
2 紅臉 hóngliǎn
  1. to blush
  2. to turn red