One of the best historical dramas I have ever seen and Lee Joon Gi's best role yet! I felt the story could have been better written but I still enjoyed the series despite its flaws. What really won me over was the cast which is the biggest reasons to why I watched the show! Everyone did an amazing job but the true star here was Lee Joon Gi. He was phenomenal and had became my favorite Korean actor all time. He brought 4th prince to life! Whenever Wang So smile, it made me so happy. Whenever Wang So would cry, I would cry. Whenever Wang So was being flirty, I would melt. Seriously. Lee Ji Eun (IU) also did a great job. She's not on Lee Joon Gi's level but these two definitely have chemistry. The most amazing chemistry I have ever seen. Whenever those two were together, it always felt like the temperature was rising! Mostly Wang So's story and the love story is what drew me in the most. Also can't forget the bromance! Lee Joon Gi and Nam Joo Hyuk were the best! Kang Ha Neul also won me over. Such a great job as the 8th prince and his smile.... can't stop thinking about it! Overall the entire cast was amazing and beautiful that I have become such a huge fan, not just for this show but for them. Even the locations were beautiful. The music... What can I say? One of the best soundtracks of 2016! My top favorite of them all. Lee Hi, Davichi, EXO, Punch, Taeyeon and so many others! I have this show's soundtrack on my ipod and always have it on repeat! I've lost count to how many times I've watched this show. Especially my favorite episodes. I was obsessed with this show before it even premiered! Despite Scarlet Heart Ryeo not being a success in its home country, it is such a huge hit worldwide. You won't regret watching.