Responses
Ohhh your theory is quite interesting. Perhaps he has a personality and havent been able to switch into his host/other personality in a long time. Or maybe seme is mistaking him for someone?
It doesn't have to be DID. Because DID usually comes from a severe childhood trauma, it could be the Yuma forgot the incident (possibly a childrape, since it was introduced in the first panel) while Rei split his conscious to help himself cope.
Ok now that I think about it, I think Yuma has DID as well but maybe a worse one since Rei keeps on talking about how HE hats the YUMA that forgot about him then maybe there's another YUMA as well. Idk it maybe a possibility so I'll just keep on waiting for the updates. IT'S SUPER IBTERESTING AND THE ART IS BEAUTIFIL. Kudos to the author for their beautiful works!!