This is the first time that I truely felt what It means to be interested in something so much to the point where you think about it all the time.

What can I say?

-Beautiful story
-Great acting
-Powerful climax of events and thrill
-Suspense at It's best.The characters are always in danger and the consequences keep you at the edge of your seat.
-Ji-sung really did a great job by switching between totally two different characters and doing each role perfectly.
-There is no boredom in this drama.There is always something happening that is important to the story.

10/10 For The Best Tv Series That I've ever seen.