MTL - Rebirth of the Urban Immortal - Chapter 3840 a little confused

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

The war of gods left the earth no winners, but a broken world.

One day, Fang Jueyu was called into the study by his parents.Fang Father: “Son, you've turned 20 this year, and it's time to tell you some things!”Fang Jueyu: “What is it? You're not going to suddenly tell me you're a wealthy man, are you?”Fang Father is surprised: “You already know?”Fang Jueyu: “What? Really? I was just saying that.”Fang Father: “However, that's not the point. Today, I am going to pass on our family's heirloom that has been handed down from generation to generation to you!”From then on, Fang Jueyu's life underwent a dramatic change.What? You want to talk to me about antiques and calligraphy paintings? Do you want Wang Xizhi's calligraphy or Zheng Banqiao's paintings? Oh, right, Van Gogh even gifted my great-great-great-grandfather a painting!Why, you ask? Because it was my ancestors who funded their education!You want to talk to me about sports cars? Are you talking about Lamborghini, Ferrari, or the Bugatti Veyron? I hold shares in those companies, and I'm even the largest shareholder!What? Your family owns a mine? Sorry, but many of the gold and diamond mines in Africa are ours too!

All I ever wanted was for famous detectives like Sherlock Holmes or Arsène Lupin to appear in my dreams and share their wisdom. But instead, why am I hearing the voices of notorious serial killers in my head, guiding me to solve a string of mysterious cases?