Why are drama writers not in favour of writing strong female charcters without any romantic attachments??
Kang Bitna becomes the Nth Strong FL who is bogged down by forced romance and fumbled character development.

Park Shin hye was clearly having the time of her life with Kang Bitna (Please write such witty sassy characters for her, dont pidgenhole her into moppy romantic FLs.). While Kim Jae Young literally plays the damsel in distress. Why did the writers think its a good idea to ruin the ML's character with poor writing. The shift from a confident no nonsense cop to one to the damsel in distress was awful to watch(grave injustice to KJY). They wasted the drama's potential by not exploring a platonic relationship between them. Moreover the runaway devil subplot was way more interesting than the serial killer one. And I am not even touching the choices made for Bitna's character by the writers.
the uneveness made me feel like I was watching 2 different dramas. The first 8 episodes were a solid 9/10 while the 2nd half felt like 6/10.

But even with all its flaws I loved that PSH took up such a role and hope to see her in similar roles like this.
This not a bad drama, but if your willing to overlook its short comings, do give it a try.