Green forest and black fortress
Qinglin Hesai is a Chinese idiom. Its pinyin is Q à NGL í NH à is à I, which refers to the place where a close friend is. It comes from the poem dream of Li Bai by Du Fu of Tang Dynasty.
The origin of Idioms
Du Fu's poem "dream of Li Bai" in Tang Dynasty: "the soul comes to Fenglin green, the soul returns to Guansai black." Later, he used the metaphor of "green forest and black fortress" to refer to the place where his confidants and friends are.
Idiom usage
It's a combination; it's an object and an attribute.
Examples
At the end of the preface to strange tales from a lonely studio written by Pu Songling in the Qing Dynasty: "those who know me are in the dark forest!"
Green forest and black fortress
serious and facetious at the same time - yì zhuāng yì xié
Be indomitable in the face of danger - lín wēi bù náo
not to be persuaded like water cannot enter a stone - rú shǔ tóu shí