I'm a Broker in the Underworld

Brokers have been around since ancient times. During the Western Zhou Dynasty, intermediaries called it proton; In the Western Han Dynasty, agents were called Yaren or Yalang; During the Song, Yuan, and Ming dynasties, there were Yayi, Yaren, official Ya, and private Ya; In the 21st century, there was inflation in the underworld. The brother-in-law of the King of Hell paid three visits to the thatched cottage and asked my grandfather, an old broker, to come out. It was a good thing that he died old and found a civil servant position in the underworld. But, my grandfather was worried about me, an unemployed young man, and always asked me to go down and accompany him. I have no choice. I don't want to die young and work as a civil servant in the underworld. I promised to be a broker and walk in the yin and yang, but the end result is unfair...