I think there might be a case of time traveling? For some reason the mc will have to travel to the past, where he will meet the younger gobling-dude, will end up having to lock him in the mirror but knowing they will meet in 1500 years and fall in love again tells him to wait for him. Thats also why he wasn't on the register of the past era- technically he didn't exist yet. Its just a theory though
I think there might be a case of time traveling? For some reason the mc will have to travel to the past, where he will meet the younger gobling-dude, will end up having to lock him in the mirror but knowing they will meet in 1500 years and fall in love again tells him to wait for him. Thats also why he wasn't on the register of the past era- technically he didn't exist yet. Its just a theory though