LIKES:
Cinematography, colour palate, location selection and music all well done. [But too many very dark scenes/no lighting.]
Interesting view of how a disabled person can live; apartment and driving. I liked seeing all the tech to make a wheelchair bound person live independently.
The concept of the AI chatbot, was what drew me into the drama in the first place.
I liked the shaman ceremony, but I wished they gave more backstory to her supernatural abilities. The costumes were well done for this too.
The ML was nude frequently, not just all the females. That was a little more balanced than what other dramas have shown in the past.
ML acting was on point and did the creepy killer justice.
Everyone was well chosen for their roles and the acting was pretty good, considering the crappy writing.
For a k-drama the production wasn’t too bad (shaky camera moments kept to a minimum).
FX: The blood and gore were well done, even though the method of killing sometimes was far-fetched.

DISLIKES:
Writing:
Sloppy writing, plot holes, limited back story and character development. No character growth for any of the main characters. Backstory of Male Lead non-existent, and what we did get seemed like an after thought. Overuse of Love at First Message/chat going on, but because there was no substance, the impact was lacklustre and failed. Believability non-existent. Some very stupid moments: a cop going to a very secluded area, without researching the location before going or telling anyone where she’s going. Her cop senses should’ve been screaming at her, long before she got to the final location. She does the same stupid behaviour towards the end of the show too. Make her a weather reporter or something that doesn’t use investigative skills, that would’ve at least made it more believable! Side stories that didn’t add anything to the story, for example the Boss Samantha, was underused. Also for a thriller, a lot of it was so muddled. I figured it out, but I’m sure other viewers were confused.
Directing:
Many times the reaction of characters was way too delayed. Also pacing was a huge issue after the first two episodes.
Production:
Lighting issues and many too dark moments, that felt like lazy camera work or editing.

OVERVIEW: I never read the book, my observations are purely based on the show. I’m glad it was only 8 episodes, although maybe writing would’ve been better if it had more episodes. It’s an okay watch, but I’ve seen a lot better from K-dramas in this genre. I’m on the fence about recommending it, as I won’t watch it again.