What is the relationship between Meng Po and Yan?

The terrible thing is leadership, and Meng Po is just one of his many managers. The relationship between Rebecca and Meng Po is the relationship between leadership and being led.

Legend has it that the underworld, like the human world, has many administrative divisions, such as provinces, cities, counties, towns and villages, and there are also many administrative leaders, such as the unpredictable land in the city. Each has its own territory and performs its duties. Yan is the supreme leader of the underworld and holds the greatest power. And Meng Po is the manager of Naihe Bridge. When the deceased arrives at Naihe Bridge, Meng Po will give her a bowl of soup to make her forget her memory on the deceased, and then reincarnate and start over. Some couples will bribe Meng Po to let themselves go, in order to return to the world and find old love. As a result, many people will find her past life among the dead.