Who is the prototype of black and white impermanence and why is it called "seven lords and eight lords" among the people?

Is there a prototype of black and white impermanence? There are also black impermanence and white impermanence in folklore, which actually have many forms of expression.

Of course, the most common images are black and white, one is eating food, and the other is very black. Legend has it that they can smell ghosts and bring those wandering ghosts back to hell on earth. So who are the prototypes of these two people? This is also a folk story, saying that the black impermanence is called Fan V and the white impermanence is called Xie Bi 'an.

What do these two names mean? No help means that if you commit a crime, no one can save you, and no help will take you back to hell and enter the 18 floor of hell. Xie Bi 'an is just glad that Xie Yan will make him stop suffering in hell and join a good family in the afterlife.

However, the outcome of their ghosts is determined by what he did when he was born and the quality of his personality.

Why do the two of them know each other? According to folklore, the two of them are good friends. Then one day spring came and they went out to play on a bridge together. At this time, it began to rain lightly, because they were close to home. Xie Bi 'an said to go back and get an umbrella, so he ran home and got an umbrella. Wu Fan was waiting at the bridge.

As a result, at this time, flash floods broke out and water poured down from the mountain, but Fan was thinking about his good friend and wanted to wait here by himself, but he couldn't take it. Drowned Fan Wusong. Then when Xie Bi 'an came back, he found himself drowned, because his good friend was waiting for him to come back here, and then because of their deep brotherhood, he hanged himself, so he vomited his tongue.