[The more that Sherlock rattles off the differences between them, the more disquieted Yujin appears. (He's never heard of this Lupin character, either: who on Earth could that be?) Clearly, it's not just names and times that are off here, but it's going to take more than a single conversation to figure out what else there is.

Yujin pinches the bridge of the nose as Sherlock begins to jot down his notes.]

I cannot pretend that I understand this, but the orbs are capable of strange, magnificent things. They pull us from any number of worlds and timelines with ease. Why not worlds and timelines that are nearer than most?

[He shakes his head. Even he's feeling a little mad, acknowledging this.]

By my best guess, that is what has occurred here. I am from the future of a world similar to, though not entirely like, your own. It'd account for all the differences. Wilson-- not Watson-- was a character created to represent me; it seems he truly is me, or someone like me, where you're from.

And you aren't what I remember of a younger Sholmes, either. [Maybe levity will help? This whole situation is so bizarre, it's all Yujin can think of to cope with it. He goes on, slightly wry:] He's blonde, for one.