Can't imagine the relationship between Jang Uk and Mu-deok, spoiler alert... As you watched episodes 1 to 11, Mu-deok is the missing Daughter of Jin Leader of Jinyowon. Mu-deok is dead already on Jin belly for 13 months and Jin is desperate for her daughter to live. Mu-Deok is also born by the use of sorcery, shifted soul, and was born together with the King Star born Jang UK with the help of Jang Gang. The relation of Naksu with Mu-deok is also connected that is why when Naksu used Alchemy of Soul, instead of the random lady that she wanted to be shifted, she was been shifted with Mu-deok bodies. No wonder why Mu-deok can enter Jinyowon because she is indeed the missing Daughter of Jin. Wow.. what a great story.