The Good:
The acting was good. The cast delivered performances really well
The story, although poorly executed, was initially enticing

The Not So Good:
I knew the writers were going to land themselves in trouble super early on when they conveniently stopped clarifying who is in charge of the body at different times. Majority of the time we could clearly tell it was Bong Hwan but, sometimes I think they made Bong Hwan So Young-esque under the guise of Bong Hwan having So Young's memory. But they never show us So Young's point of view for us to truly understand how much of what was happening was her vs Bong Hwan and if she was changing to be more like Bong Hwan because when she got her body back she continued acting Bong Hwan-esque.

The body-swap was not done well because they did not think through how the whole switch-co-habitat-switch-back would cohesively work.

The Other BIG BIG BIG Problem is the Characters lack substantial motivation for why they do what they do. The story plot is being moved forward on toothpick legs. The greatest motivator in this whole world of Mr Queen is unrequited love. The only other plot mover was the Dowager and Mother-in-Law and the Dowager's brother's thirst for power. Everyone else was doing this because the person they loved or who they loved was not loving them. We get it, love is important but this is a bit much.

First half of the show I could forgive a lot of these problems but by the last 3-4 episodes I was not even concentrating completely, I just wanted to the end.