Oldboy: It won the Grand Jury Prize at Cannes, and Choi Min-Sik is iconic as the hammer-wielding Oh Dae-Su, trying to find who imprisoned him in a hotel room for 15 years.
I looove the Vengeance Trilogy. They were all on Netflix at one point or another.
A film I would like to see again. I have yet to finish the Vengeance Trilogy.