What could a human emperor do that could affect the underworld?

When Cui Jue opened the letter, he was immediately overjoyed: "I already knew about Wei Zheng's dream of beheading the old dragon the other day, and I praised him endlessly. I am also grateful that he takes care of my descendants day and night. Now that you have sent this letter, Your Majesty can rest assured. I will escort Your Majesty back to the world of the living and back to the Jade Palace."

Then Cui Jue led Zu An to the Netherworld. Zu An didn't expect to come back so soon. Looking at the Gates of Hell, the Yellow Springs Road, the eerie spider lilies, and the hazy Yin Mountains in the distance, he felt a sense of familiarity.

The two then entered a city, which was the territory of various Yama Kings. Not long ago, Zu'an had not entered this place.

They hadn't walked far down the street when they saw the late Emperor Li Yuan, his elder brother Jiancheng, and his younger brother Yuanji standing by the side of the street. They stepped forward and exclaimed, "Shimin is here! Shimin is here!"

Then Jiancheng and Yuanji came to grab and kill him. Zu'an, who had no cultivation now, was unable to dodge in time and was caught by the two.

Jiancheng angrily cursed, "It's one thing for you to kill me and seize the throne, but how could you not even spare your sister-in-law? You're worse than a beast."

In my previous life, I watched some related TV series. It seems that the screenwriters really liked to have Li Shimin and his sister-in-law have some kind of relationship. It's a fictional story, not just nonsense!

He hurriedly denied it: "Absolutely not. I have always been very respectful to my sister-in-law and have never offended her in the slightest."

"If there isn't, why are there all sorts of rumors circulating in the underworld!" Li Jiancheng roared.

Zu'an saw Li Yuanji standing to the side and found his face repulsive. A wave of disgust rose in his heart. It seemed that Li Shimin must have hated this disgusting younger brother when he was alive. So he casually said, "It must be a rumor. I am very respectful to my sister-in-law. I just took my brother's wife as a concubine. Maybe people have mistakenly said that she is my sister-in-law."

Li Yuanji: "???"

My hair turned green while I was eating watermelon?

He was already short-tempered, and upon hearing this, he couldn't stand it any longer. He desperately tried to pinch Zu'an, yelling, "I'll kill you!"