It kept me interested till the end. Wasn't bored of any episode, which in itself is a great compliment to this drama. It seemed to be confusing in the beginning, but they wrapped up all the loose ends, or at least most of it. At first, it seemed to be like a weird relationship, almost being incest; but it wasn't the case, which made it seem better. Though I mostly never do ship comparisons, I must say Ahn Yo Na x Oh Ri On is the best couple than Cha Do Hyun x Oh Ri Jin.
Though in the first few episodes, Hwang Jung Eum's acting seemed to be a lot more than required, felt like overacting honestly; but later on, her acting improved and it became pleasing to watch. Maybe it took her a very long time to get into the character.
There is this one song in particular that will keep ringing in my mind for a few weeks now - "Auditory Hallucinations".