I just spent some cash on seven chapters of the raws, lolllll (I couldn't translate it yet tho cuz my other phone back at my house and that one has the translator installed so I'm going by what I see and not what they say.)
Anyways, the Dream Palace got destroyed because Jay left it during his time in the institution. The unicorn just follows Seolwa at a distance I think. And the Doctor and his lover survives, they're on a world tour. Literally, they sent Jay postcards of their trip.

Copy pasted my notes so read at your own risk.
Okay so how I understand this story is:
Some Backstory: Jay is a dragon that never turned into one so he became a kang cheol, and because he is one he has some sort of insanity?? And he made the dream palace for his own greed just to toy with mankind??
Now, he needed the bead, because it was the only thing to make him sane.
Also, the bead's effect (it grants wishes) happens only once.
Main Plot:
>Start of story is set in WW1.
>Seolwa is a low quality Do-myeong.
>Seolwa has a twin (idc about his name:orange head), twin doesn't like him because Seolwa has a special aura.
>Twin fools Seolwa into touching the ground to make Seolwa low quality.
>Because he's low quality he gets thrown out.
>Seolwa was about to be raped by huge guy but was rescued by masked guy or killed by him, bringing him to Dream Palace
>Who is masked guy?
>At dream Palace he becomes a maid, but they were actually using him for the right time.
>Jay needed him.
>Seolwa got blinded for a trial??
>He and Jay go through trial, Seolwa gives Jay his soul bead. And tells Jay he loves him.
>During this the Twin wanted to rule Dream Palace, Twin is also a defective mass murderer. But Jay survived and gets the Bead.
>Jay goes back to Dream Palace after he gets his wish.
>But then, Jay kept on having hallucinations of Seolwa.
>Jay wants to get Seolwa aback so he searches for another bead.
> Inspector comes in.
>Inspector is looking for the peach tree murderer, during his search he finds the older Do-myeong.
>Older Do-myeong gives him his second bead and warns him about the twin.
>At Dream Palace, inspector gets trapped by Dream Palace's tricks.
>At the same time he sells the bead, Jay was looking for one.
>Inspector and Camera guy become their bait.
>They start their search for Seolwa.
>During their search, the twin saw Seolwa first and they became one... literally and grew wings.
>Jay fell in love with Seolwa after Seolwa gave his soul bead to him and has been looking for him, they found each other but Seolwa was already one with Twin so he "reached nirvana" and transcended?? (Still need to deep dive because wtf?)
>Current chapters' story is set at the start of oncoming WW2.
>Mid story Jay lost his mind at some point and got institutionalized but the Doctor rescued him, Doctor went to Hawaii and Jay stayed back to search for Seolwa.
>Seolwa does exist but he's selling himself.
>Jay was too late and Seolwa already had his own sugar daddy.
Theory: 1930s Seolwa is either a reincarnate of old Seolwa or just Seolwa himself with his past memories forgotten.
Look for RAWS.