Achim Sperling’s review published on Letterboxd :
Imo the weakest of the trilogy, but maybe I have to rewatch it. I missed several key facts and found myself wondering where we are, who they are and what's happening? The subtitles didn't help a lot and if you're presented with a korean document in a close-up... well, I can't get a single clue out of those characters, my bad.
In the end I felt sympathy with all of them but that could have been more intense if some things were explained better. Nevertheless the story is descent and so is the film but its no match to Old Boy and Lady Vengeance.