After reading 18 chapters, I arrived at two things:
First, Eunha is doing what he did in the past; testing his older brother. That is why he appears to be somewhat pitiful in front of him.
Second, Eunha has some kind of illness or plan on unal*ving himself after accomplishing his 5 wishes from his older brother.
I reckon Theo will soon use his remaining strength, magic, and resources to send Umehiko and Momo back to their own world. And that's because he loves him too much to the point of sacrificing himself and letting him go. He also might give up and abandon his wish of becoming a human just to prioritize Umehiko and his sister's well-being. I can't, Theodore's character development gone from 0 to 180, indeed.











I really hate it when a published chapter got removed suddenly the will be re-uploaded huhu
Looks like it's a better version and has extras