The King in Love prince is ready to drop everything for her, but this isn't main plus of this show, this is best chemistry I've seen in asian dramas, great acting, no cliches, unpredictable, beautiful main leads and beautiful cinematic scenes, music, every detail, very realistic, true and beautiful story, body language, complex feelings and characters(not only leads, every character is multilayered, not black or white).
it's a triangle love story (prince, his best friend and beautiful, strong, smart, really interesting girl), but not that kind we are used to, when you know who is endgame and second lead is just someone who loves one sided, you will kind of ship both of them, both have unique chemistry, both are good interesting, but then you will choose, so will FL and chemistry is crazy, every detail is perfect and will not disappoint you. I even rewatched twice... just try 2-3 episode and then you will love it.