Why I liked the drama?

- Amazing casts. There's nothing bad to say about the casts; they're amazing! I liked Go Kyung Pyo's acting as the psychopath. He made some really great disturbing expressions. I honestly was uncomfortable every time he appeared on the screen.
- A grey characterization of the female lead. I think we need more story about Irang because she sometimes acted as a bad person, but at the same time, I can see her humanity. She's great at fighting and a straight forward person which really complemented Dong Soo.
- Great CGI.
- The drama delivered the dark, uncomfortable feelings really well to the viewers.

Why I disliked the drama?
- Towards the end of episodes, the story became messy and so many plot holes. Maybe they wanted to leave the room for season 2, but who knows?
- It wasn't really exciting for me at some point, but I forced myself to finish the drama.
- THE ENDING. The climax between Dong Soo and Jin Seop's was meh. I was hoping for a grand fight between the two 'connected' people, but nah. We don't have it. Also, what's with the cliffhanger? They're really teasing us for season 2 in the ugly way.
- The human trafficking gang. I don't really get their importance on the drama. They kept being highlighted, but actually they're not that interesting????
- The stupid girl who got murdered on the rooftop. Girl, if you found out that you just slept with a serial killer, you should've gone to the police, not confronting him in the rooftop? Where he could easily dispose you? In conclusion, she 's stupid af.