According to MyDramaList I have watched 52 days, 2 hours, and 50 minutes of Asian dramas and films. And I haven't inputted every single one I have seen thus far. Not to mention all the Western media I consume on a daily basis.
And yet, The Flower of Evil is literally the best Korean drama I have ever seen. It's probably one of the best tv shows in general I have seen. I am caught up to the most recent episode (episode 10) and I am rewatching it from episode 1 again. It's just that good.
Just do yourself a huge favour and watch it.