Mu-deok is cute with charmy appearance. It's no doubt.

But, her soul was replaced by Nak-su.

The "one" who actually interactive with Uk is Nak-su, right?

Uk's master is also Nak-su but not Mu-deok.

So, when Uk says "I like Mu-deok", who exactly does he like?

The relationship between the 3 male leads, "Mu-deok", and "Nak-su" (the inside/intangible/intrinsic/hidden side of Mu-deok) seems to be the core story that the drama wants to tell us.

(1) The one Uk likes is the killer Nak-su. Uk knows Mu-deok is replaced by Nak-su (killer Nak-su) but he finds her inside trait and still likes her.

(2) Seo Yul also likes Nak-su but the young Nak-su, before she was a killer. Seo Yul does not find the inside beauty of the killer Nak-su and wants to change her (protect her).

(3) Crown prince likes Nak-su but he does not know she is a killer. We still don't know if he will/will not like Mu-deok after he knows who he actually likes is killer Nak-su.

Do you think/feel so?