Let's address the elephant in the room first, okay? The drama was way too long. They should have cut it down to 100 episodes. For a third of the drama, they were scrambling to keep the show alive. Even if you can handle watching a very long drama of 134 episodes, it is clear by the overall writing direction that they stretched the story as much as possible. Now, onto the main issue. I felt that we were deprived of an epic relationship between Princess Seok Young and the main character because of Cho Rin's character. The Princess and the main character had great chemistry, but it was overshadowed by the romance and plot involving the main character and Cho Rin. The few moments we got were not enough. I will also take points away for not being historically accurate to the point of it being a fantasy. During their conflict with the Khitans, the Turks and Goguryeoans cooperated, showing peaceful relations between the two. It is not accurate to say that the Tang helped the Turks and Goguryeoans to eliminate the Khitans.