Summary: if you have watched the top 10 historical dramas, then watching this will be a re-arranged same-old scenes of amnesia and power control.
What makes it poor quality are the main two actors. The chemistry is ok, and acting ok. There are many mishaps and nonsense.

Pro:
-love the emperor. Good acting
-good costumes,
okey but same old story line.
-the only original is main girl slept with the emperor twice in a lifetime.

Cons
-baby face not so good acting of the main guy
-main girl seems lame
-recycled location, recycled people. Seem low budget. The wedding was weird.
-same old plot, just re-arranged.