Cau:
Your theory of the mirror/scenes being delusion is a very good one. Lets wait and see.
Not only Uk but Dangu and Yul coud have been playing with Bu Yeon. So definitely The Mudeok´s body is not Jin´s daughter or there are many people who would have recognised her. Probably Bu Yeon´s soul is inside that blind body/Mudeok. Why? We dont know at all. And now there are two souls, Bu yeon and Naksu inside her body. Confusing as hell. I hope everything will be explained.
jxxwxxstan:
But Heoyeom recognized her ears. We don't know how long she's been missing. Some people change a lot from infancy to adulthood. Also, looks like Choyeon doesn't remember her sister, so either the age gap between the two is big or they were both really young.
The connections between Mudeok and Jin Bu Yeon are all really convincing, but (if she's still in her own body) I find it really implausible that even Bu Yeon's mother apparently doesn't recognize her after 10 years or so. And who knows who the ears that Heoyeom recognized belonged to?
A couple of other questions I don't understand, but may support the Mudeok/Bu Yeon relation.
(1) Why do the birds and artifacts get disturbed when Mudeok enters the Jin compound, and she experiences an energy disturbance and seems to see the vault entrance (if that's what the wall is)? There must be a Jin-family relation there. The same thing happened with Hemp Master Lee, and I suppose he's also related to the Jin family since he was able to take Sapsali from the vault? (Or maybe it's just because he's super-powerful.)
(2) The mirror says to Mudeok (maybe trapped in the vault by the Jin mother and daughter) "So it's you. It's been a long time." Is the mirror (very plausibly causing visions or delusions) recognizing her as Bu Yeon?