For real, I'm also curious about the "Wall" thing like is it the "Special gift" the Author of the novel [Three ways ro survive in a ruined world] gave him or is the Author the "Wall" itself? What kind of competition the Author won? And what kind of being is the Author? Is it a Human or a Constellation?.....(〜 ̄△ ̄)〜
                                                Hmm, I see but you must have misunderstand, what Persephone just said is "This is why I like you" it does not mean that she has feelings towards Kim Dokja but she just find Kim Dokja interesting as well as  Hades too who grew specially fond of Kim Dokja because he sees Kim Dokja as a child I suppose and I also think the reason why Hades grew fond of him is because he's envy of Zeus who had a child like Heracles. 
Welp, that's just my opinion though                                             
Oh my, sorry for misunderstanding, I thought it was Persephone(The Queen of The Underworld Olympus) since she's the only Constellation Queen I know. However, you're wrong about one thing, the Constellation you're talking about is not called "Constellation Sillia" it's "Noble Who Slumbers on Fine Brocade", she is The "Last Ruler of Silla Kindom; Queen Jinseong", and she is the sponsor of "Min Jiwon" an Actress who has feelings towards "Kim Dokja" instead of "Yoo Joonghyuk" and yes she is the one you are talking about

		
Even the Bois who dig his grave said he's a Sleeping Beauty, so what part of him is ugly??
For the folks who said he's the ugly king, why don't you do the same thing the Bois did?
¯_(ツ)_/¯