
There is not a real hyung, this is just something the hotel came up with so Doyoung gets to know 12 sides of Hyunjin personality, based on this: http://www.mangago.zone/read-manga/hotel_phryne/uu/hotel_phryne-chapter-4/20/
Not saying we only have 12 personalities, tho.
I think Doyoung has entered a parallel universe, and the real Hyunjin is still outside waiting, or even better, facing the same challenge with 12 Doyoungs.
And I was thinking, what if it happened to us? What if there were 11 other than us with the same memories, believing they are the real one? does it matter if the fake one wins? I mean, at the end of the day, why do we only want the real one? is it worth the effort? I believe it is, there must be some purpose for this "game".

It’s possible that none of them are hyung, but that page doesn’t prove it.
I was thinking that it’s different aspects of personality, and that the one with the right personality would be hyung. To think that his personality could be splintered into the others is pretty smart, then the Mc could learn about all the different aspects of hyung like that page says, but then he won’t be able to truly know him unless he could pick out what makes him different from the rest.
It’s a cool idea that he’s not, but it removes the danger of the game. The real hyung is likely to be in the group.
Guess this is not my cup of tea ( ̄へ ̄)