I seriously missed seo in guk in my dramalist. ? He's hot here BTW. I like the storyline as well.
I've got multiple theories though which have similarities to the ones posted here previously.
I just kind of have a feeling that this drama could end at ep12-14 but they have to hit the 16 ep target that's why they had to include supporting roles that would seem to have a big role in the drama but actually they wouldn't do much for our main leads...? I dunno. Just a feeling. ?
So here goes my theory...
1. There was someone like Myeol Mang before. He probably made a wish like dooming a lot of people just like Dong Kyung's initial wish or he wished something beyond someone's imagination? And probably that wish was granted and because that wish was granted, he was the exchange for that wish, so he became Doom. That's my first theory.
2. Myeol Mang wants to grant Dong Kyung's wish of Doom so he can get out of the hell hole he is in and that Dong Kyung would replace him. I kind of got this idea because of his initial conversation with the deity. Asking if he was born or how did he exist and about his birthday. I think the reference of his birthday is the day he became Doom. Hopefully, this gets answered soon in the following episodes.
3. My last theory! Remember when Myeol Mang told Dong Kyung that if she doesn't do her end of the bargain, she's gonna live and her loved one will have to die?
Dong Kyung will fall in love with Myeol Mang and he finds out that this happened (he probably has fallen in love with her too by that time) he'd let her defer her wish and he'll end up disappearing so Dong Kyung can live and he will finally die. Which is going to be the tragic part.
If we add another factor like Dong Kyung becoming Doom when he grants her final wish, then he would probably do some ultimate sacrifice so she doesn't end up like him. Since it's so obvious that he hates his fate and the way he had to live day by day being Doom. Knowing this, Dong Kyung would probably want to replace Myoeng Mang from his misery and wish for something like taking his place.
But that would be the ultimate irony because both had already fallen in love with each other and they have to make ultimate sacrifices for each other.
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So basically this drama has a doomed ending... unless the writer makes up something really really good that both would end up alive or be able to survive at some point. I just wish this doesn't end up like GOBLIN. Because I seriously hate afterlives. The story is about the present not about their lives in another timeline/world. That's just BS for me and lazy writing.
Also... no time skipping hopefully. I'd be really pissed off with the writer if there's a time skip for this drama.