I was a drama maniac 2 years ago. Some work issues, and I couldn't follow dramas.
And then some devil said to me "You should return your own world" last night.
I just randomly pick this drama and guess what this is heaven :D

The drama contains mystery, crime and a little bit romance (just a pinch of sugar).
Just one episode,and hooked right away. Just 10 seconds and ? was at the hands of the devil.

Aside from jokes, lets get deeper

Story: it was great. It never make me stop watching or bored. I just finish all episode one day. There are a fex mistakes or blurry spots but you can easily ignore them. Story has depth, crime, passion (forboth sides, the good ones and the bad ones), charismatic villans and mystery. I'm not giving spoilers but I know there are people out here, cannot avoid looking the end. So just ignore these. It is a end for everyone. Actually I choose my happy side . Ahh I really wanna express my feeling and theories abut the end. But i shouldn't :)

Cast: Everyone in this drama series, from the main crew to the little ones, played their roles exceptionally. Especially Jung Kyung Ho and Park Sung Woong. I closed my drama series adventure with Heartless City and opened with him again. He is so grown as a actor at this point I wanna cry. Just watch him, you will understand

Music: I couldn't listen very well becaouse of the thrill and my eating fingernails but music is certainly bring the thriller to the peak

Rewatch value: definitely i will watch tihs over and over again if my heart allows

Just watch it and you will never regret