Wesley R. Ball’s review published on Letterboxd:
I will kill you when you are in the most pain. When you're in the most pain, shivering out of fear, then I will kill you. That's a real revenge. A real complete revenge.
My first taste of Korean cinema is arguably one of the best that I'll ever get. Barring Secret Sunshine and Oldboy, I've been hard-pressed to find another Korean film as well-crafted as I Saw the Devil. Its twisted, mystery/crime/revenge story is one of my favorites in cinema history, and I could watch this many times over and not get sick of it.
Most people who really know me personally wouldn't expect me to love a film as horrifically violent as this one can get. But the violence is actually what draws me closer to the film itself. The killings committed by the villain are intricate and exciting, and the fact that they were showing a serial killer film from the point of view of the serial killer himself was refreshingly unique to me. I love when a director can take a new twist on a classic crime genre and keep me thrilled the whole way through.
I'm not completely sure why, but I feel that the actors in this film are much better than any American actor I've seen recently. Their performances in this film just outshine any recent American performance that I can think of, and Kim Jee-Woon's directing in this film is some of the best that I've ever seen. If you haven't seen this yet and don't get phased by graphic violence easily, I highly recommend you watch this as soon as possible. I Saw the Devil is one of my personal favorite Korean films that I have seen, and one of my favorite horror/crime films of all time.