Let you think about it first
She is not the antagonist girl in this...
Ilya and her will become frienemys.
She didnt persue the duke and claiming she dump him to save face...
Alsooo, they did not steal the design. Ilya's designer, I think from what I remembered, who made the carraige sold it to them secretly.
Is it possible that he wasn't really inside the novel but actually in reality and he actually had DID???
And his other personality was really the character in the present like what the doctor said?
Maybe he really did got delusional because of depression, pain and shock. Then his cope up mechanism is the personality he has now.
Also, he never mentioned the name of his mom and sis by the way...
Plus, the things he remember in his sessions are always in the novels.........
This is just a theory by the way...
Let me be.
this is actually a fire theory bc it would also make sense how before the tests came out, he wanted both of them to be betas, so in the opposite world, the abo universe doesnt even exist cuz beta is basically default.