If you're considering whether to watch this or not, this your sign: watch it. I promise you won't regret it.
I first started watching Flower of Evil with very low expectations thinking I would end up dropping it after the first episode but 5 minutes later I was completely hooked and couldn't stop watching anymore.I watched it all in one day and even stayed up all night just to finish it.
I never liked suspense/ criminal dramas but this one was so different, it made me cry, it made me laugh, it made me angry, it was a completely new experience and I loved every single second of it. It's easily one of the most beautiful dramas I've ever seen and it became one of my favorites way before I even finished it
Needless to say, I feel like I'll be rewatching this very very soon, I felt really empty after finishing it and having no more episodes to watch and I miss the characters a lot.
Love it and can't stop recommending it to everyone, please watch Flower of Evil!!