ㄎㄞㄔㄥˊㄅㄨˋㄍㄨㄥkāichéng‑bùgōng

开诚布公
  1. 三國志諸葛亮》:誠心公道。」開誠布公形容誠懇坦蕩無私 只有開誠布公會談可能進展順利」。

lit. deal sincerely and fairly (idiom)​; frank and open-minded, plain speaking, Let's talk frankly and openly between ourselves., to put one's cards on the table
offen (Adj)​, offenherzig (Adj)​