It is the best historical drama in terms of historical accuracy and accountability. It's not just another historical drama or another eye-candy drama made with a bunch of pretty boys in costume who can't act to save their lives. On the contrary, it has great acting, fighting scenes, and great pacing. Choi Soo Jong's acting in this drama is top-notch as usual in this drama. He is the true master of this genre. Now here are two major flaws of this drama Wang Gun's reluctance does get annoying and was becoming beyond unrealistic at a point. Secondly, the last 1/3 of the drama pace changed dramatically and the storytelling began to go all over the place with little direction. The ending felt like a race against a clock. The ending somewhat saved the last 3rd of the drama had not been for that great ending trust me my opinion on the drama would have changed. Lastly, as a Christian, I hated the force of the Buddhist narrative throughout the story. Nevertheless, this is still one of the best dramas I have ever seen.