Both plots is around headstrong, intelligent and strong female leads that go from them being the underdogs to gaining power.
i liked that in both shows the main character knew how to stick up for themselves and actually had more than one fight scene (where they didn't need the main guy to save them all the time).
Empress ki definitely had a better and well developed romance arc.

Both have the same theme around music, a romance between a guy in the industry and a girl trying to get into the industry and a melodramatic mystery around the leads parentage.

both have a marriage contract plot
both main couples have amazing chemistry and a good romance pacing
both have great supporting characters!

loved both dramas!!!!

So similar. only difference is that the guys don't immediately fall for the main girl in Asuko March.

Amazing cast and well written main female character. Both have mystery in the forefront of the plot but with a hint of romance and comedy.