ottoman2222’s review published on Letterboxd:
Sympathy for Mr. Vengeance is a gripping movie, which feels very real. The film's editing is excellent, and is shot with excruciating detail, which is often the case when it comes to Park Chan-wook films. The action scenes can be a little squirm inducing but compared to later Korean revenge films such as I Saw the Devil, it is nowhere near as graphic.
Song Kang-ho does extremely well in the role of Park Dong-jin. He is practically flawless in nailing the emotions of a man who is bent on revenge at all costs. Shin Ha-kyun as Ryu is solid, yet can't really compete with Song Kang-ho's performance. He does plays the character who is the easiest to empathize with, despite the terrible things he does.
This is the first film in the Vengeance trilogy and it sure starts of strong. While Old Boy is the most famous of the three films Sympathy for Mr. Vengeance is definitely a must see for any fans of Korean cinema.