What is the true identity of Black Butler under taker?

The funeral home calls itself "Xiaosheng", but he is actually the legendary God of Death. It is said that he once threw Marie Antoinette into hell and tried Robin Hood's soul. He looks like a man with long hair covering his eyes, wearing a high hat, and a scar on his face. But it is said that Zhenrong is a handsome guy who makes people fascinated. He has a yin and yang personality, and his words can be creepy. He likes to play pranks (such as hiding in coffins to scare people) and doing "autopsies" on corpses. He has no interest in money and loves collecting funny jokes. As the name suggests, he runs a funeral ceremony. On the surface, it runs a coffin shop, but in fact it is an information provider, working with the Fadom Haiwei family and others as the queen's "lackey". However, I don’t like the Queen’s small favors. All the furniture is abnormal, the chair = coffin, the tea cup = beaker, the cookie jar = urn, the bowling ball = skull, and the bowling pin = the memorial tablet of the deceased. Maybe it's because he's retired that he looks very lethargic. ...