As The title character, Song Il Goo is okay. But didn't make a great impression on me. Someone else compared him to Errol Flynn. I'm sorry I can't agree with that. I couldn't see any charisma in the actor at all. He was adequate, but that's really about it. But Luckily he is surrounded by a great cast. The best were probably Hu Joon Ho as Hae Mo Su, Oh Yun Soo as Lady Yoo Hwa, Jun Kwang Ryul as King Geum Wa (although I din't know what the laughing was about) and the guy who played the prime minister. But most of the cast were fine. I liked Han Hye Jin as So Seo No, Kim Seung Soo as Prince Dae So, and others too. At first I liked Bae Soo Bin as Sayong, and even thought he might have better in the title role. But on reflection , it was a rather one note performance. I did like the gay relationship though. The costumes were magnificent. The battle scenes were the best I've seen in a Korean costume drama. Although it was only from around ep 50 or so, that I thought that, or began to realise it. I'm not sure about the jumping around. If it's for a purpose fine. But some of the time, it seemed to be just for showing off. Some great horse riding scenes. Interesting to read from another review (same personwho mentioned Flynn,) on that aspect of the series. The costumes were absolutely magnificent. That was probably where most of the budget went.
