Matt Thomas’s review published on Letterboxd:
A terrific, visceral, horror-thriller. The sharpness of the image is commendable, as are some of the highly original camera moves that director Kim Jee-Woon comes up with - especially the attack in the car. Min-sik Choi (Oldboy is making a habit of creating memorable, slightly deranged, characters. And this one is no exception.
What I love most here is that the lead character's motives aren't given any real explanation nor backstory, which makes him come across as even more psychopathic. Probably emphasised even more by the borderline disproportionate level of revenge and retribution that is extracted on him.
The relatively long running time skips along quickly by cleverly incorporating many different settings yet still manages to leave you exhausted by the end. In a way it's almost a roadtrip movie.
If it hadn't been for the clumsy handling of the 'head scene' this would easily be a 5 star film.