This drama has basically everything you want. Romance, action, "deep philosophy" (with all that betraying and emotional stuff), and to top it all off, one of the best, if not the best looking main leads.

At first, it was slightly tough to get through the story due to their goodheartedness (it was to the point of being foolishness). Stupidly brave and "naive" main leads (for the lack of a better word) were always a pain for me, but im glad i stuck around. After episode 6, it got a lot better and the characters just improved a whole lot.

The other lead, Han Tae Sook was also a damn good character, even if they didnt give him that much screentime. Rational and not hotheaded, but stil humane enough that you would be able to sympathise and like him.

The characters in this drama is just 11/10, maybe could have had a little more romance, but really couldnt ask for anything better.

Music wasnt that prevalent, at least i dont have a strong recollection of there being much music with significant effect in the improtant scenes. The OST is pretty good though, helps with making the emotional vibe of the series.

Main leads themselves wouldve gotten a 8.5/10 at least from me, but with all the extra bits stitched in between, it really makes the series one of the best ive ever seen.