This was the first kdrama I watched and really liked, so I may be a bit biased (also because Park Hyung Sik is really cute). Some may think that the lovey-dovey parts of the show did not mix well with the dark & gory parts, but I personally loved the contrast and felt like the 'darker' part of the drama made it more balanced. I particularly loved the casting, and I feel that Park Hyung Sik and Park Bo Young (Puppy Couple) had amazing chemistry. I often rewatch clips of them because I find their interactions adorable. (On a sidenote, this drama also holds value to me because it introduced me to kpop, since I found out that Park Hyung Sik is friends with V from BTS).