Firstly the cast is soo fiiine, I started watching this drama mainly becouse of Rowoon he amazed me with his acting skills for the first time in extraordinary you and this, it just felt so real. Also I really like the female lead too and her character, she has strong personality and she's also good in fighting. I loved the parts where she was fighting with the bad guys the most.
Story? I really liked it and when i was thinking about watching it i had hard time choosing if i should, becouse the main reason is that i don't really like kdramas with gream reapers but this, it never made me feel bored and i was fascinated the whole time, i was waiting every week for new episodes. But i haven't watched it all yet so.....
And the only thing that it lacked was that this kdrama has only slight romance or even maybe none. its just about my preference but i think it would be better with it. Im right now on 13 and half episode so i can't really tell much but its ending in a few episodes so.