It's no joke that I rate this all 10/10. This drama absolutely is the best!

Pros:
- UNDOUBTEDLY the BEST crime-romance drama so far. Yes, there are good crime dramas and there are good romance dramas. But if you mix those 2 genres, FLOWER OF EVIL IS THE BEST.
- No plot holes (Trust me, I'm sensitive about plot holes but I couldn't find any in this drama)
- Solid plot. No time-wasting on unnecessary romance scenes.
- Easy to understand the story. Usually, crime dramas require high thinking capability. However, Flower of Evil comes with a brain-friendly package, yet so powerful.
- 15/16 nerve-wracking episodes.
- It really broke my heart. (The watchers will be grabbed to this drama eerie and gloomy atmosphere)
- The writer(s) of the story is sadistic, they love to torture the audience's feelings.
- Long mystery. This is the longest mystery I've experienced in the K-Drama so far. This drama won't tell you who is the actual serial killer for a while and THIS GIVES YOU TIME to guess who is it.
- Don't worry if you're confused about the story in the first 4 episodes. Episode 7-15 will answer ALL of your questions.
- Actress and actor's acting is good, especially for Hyeon Su. It's hard to act as a feelingless person, but Hyeon Su did well! Even when he's crying, even though it looks unnatural, but that's how a person diagnosed with (I forgot the term) feelingless syndrome cries.
- Moon Chae Won (her beauty is on another level lol).

Cons:
- The comedy is not that much, but actually, this supports the drama atmosphere. This is not actually a con, huh?
- 2 unrealistic scenes (where Jiwon should have dealt with the criminals first before coming to her beloved husband), Jiwon is a police officer after all.
- Isn't Chaewon (Jiwon)'s make up was too thick for a police officer?