sī​mǎ​zhāo​zhī​xīn​lù​rén​jiē​zhī

an open secret

  1. everyone knows your game
    An ambition or conspiracy that is obvious to everyone; used to describe a plot that is so blatant it requires no explanation
  2. known by everyone
    (idiom) understood by every passer-by; well known to all; a household name