The casting was exceptionnal! I've seen a lot of Bai Lu's dramas and she was just as great as always, but it was only my 2nd time seeing Zhang Ling He and he really made an impression on me. Some scenes were so intense and powerful I had to watch them twice or 3 times just to focus on there expressions without needing to read the subtitles. Same for the princess, great choice.
I would say I liked a lot of the characters, even the vilains, they were well written and truely usefull to the story.

The writting of the drama was also really good : great storytelling, interesting dialogues: no basic or common "wise" sentences - after watching so many Cdramas, they kind of all sound similar at some point - but these ones were truely original and adequate.
I really liked the concept of finding, NOT the best person you can find, but someone that truely fits you and understands you. There are so many dramas where you don't actually understand why the main leads are in love with each other... okay they're hot, but what else? Why are they so willing to sacrifice everything for this one person? Well this drama did an amazing job showing that.
I'm the kind who likes to skip ahead when the political games get too boring or take too much place, but I don't think I've done this once in this drama. Despide the main romance not being at the center of the show, they still managed to keep it interesting.

I look forward to watching other dramas by this screenwriter and seeing those actors again.