One of the best Korean dramas that I have ever watched. Heartbreaking and exciting all at once. The plot was quite well written and there was good acting all across, but to me, Lee Seo Jin and Kim Min Joon, the 2 male leads, stole the show with their heartfelt acting. The only drawback was the shoddy action sequences. The aerial flying was a bit amateurish but the plot and the dialogue and the characters itself are all so riveting, that the action choreography doesn't matter. Highly recommended.