For now all I think is that UK won't fall in love with the memory less naksu for sure she might somehow remind him of her that's all. In case of the memory less naksu I think she's already started to like him all over again because she finds him similar to him nd he's the only one again this time also that's helping her free her just like in previous part as mudeoki said you are the only person who wants me to be alive all others wanted me dead
And I guess that's it for Bu-Yeon - a sad end. Her soul is dead, her body converted to take shape of Naksu's soul.…
I think bu Yeon never had any bad intentions towards UK for all the scenes she had so far never once I thought. I wish she would just merge with naksu in end but I guess we can't have both