I was excited to watch this show, in fact i tried to savor it for special occasion to watch it. As soon as i watched episode 2, i was praying for it not to fall into trap of those Shoujo anime/manga. Unfortunately, it followed the exact same pattern, very hard to watch all the Princes swarming the heroine and falling in love with her. Of course the one who is the black sheep and is the most outlier will eventually wins her heart etc etc. I can name 10 anime with exact same plot, going back in history, some political intrigue, some tear jerking story about the ML and eventual romance. I was hoping more from this highly praised kdrama (And I've watched over 50 shows), but this one really could not differentiate itself from some run off the mil Shoujo anime/manga.
If you have a hard time believing me, just google "time travel reverse harem manga" and see for yourself.