be scrupulously honest even when there is no one around
The synonym bulie darkroom generally refers to bulie darkroom. Bulie darkroom is an idiom. Pinyin is B ù Q ī 224; NSH ì, which means not to do anything shameful where no one sees it. From the firefly ode.
Idiom explanation
Deceiving: deceiving oneself; darkroom: a place invisible to others. Where no one can see them, they don't do shameful things.
The origin of Idioms
Luo Binwang of Tang Dynasty wrote in the ode to firefly: "a gentleman of the same kind has the right way. He goes into the dark room without cheating."
Idiom usage
How dare you steal your feet after reading the books of Confucius and Mencius? Ming Dynasty Feng Menglong's Xingshi Hengyan Volume 13
be scrupulously honest even when there is no one around
the point of an awl sticking out through a bag -- talent showing itself - yǐng tuō ér chū
win a noble position for oneself and for one 's wife and leave it to one 's posterity - fēng qī yìn zǐ