Felipe Fritz’s review published on Letterboxd:
I Saw the Devil is one of the most upsetting, violent and graphic movies I've ever seen. It's like Prisoners meets Martyrs. Times a thousand.
It's insanely brutal, and not in a fun way; Not even close. My heart stopped in more than one ocassion. It's beautifully shot, but seriously, this movie is fucked up. Like, really fucked up. And I love it.
It's right up there with Oldboy as one of the craziest revenge thrillers ever made.
Also, Choi Min-sik beats someone with a hammer and the Oldboy fanboy in me just couldn't contain himself.