When Adam received the message from Jacob, he immediately returned home. He would rather deal with demons instead of sitting in a gallery studio.
You've read it right. The art pieces that Hana made were placed in a gallery studio. They no longer deal with online buyers. Many people wanted to see the art pieces and many artists like Hana's works. Some bigtime people who were painting enthusiast bought someone the paintings and Adam was the one who makes the deal.
He didn't let anyone handle the art pieces aside from him.
This was what keeps him busy every day while waiting for Hana to be reincarnated.
"Let's see how powerful this demon that Jacob can't even handle her." Adam muttered as he stepped on the accelerator towards Book 'n Chill café.