Oldboy (2003)

There are some movies that keep you quiet for a few minutes after seeing them; Oldboy is definitely one of them. I am a bit biased since this is one of my favourite movies. Directed by Park Chan-Wook, it is based on a Japanese manga of the same name written by Nobuaki Minegishi and Garon Tsuchiya. Oldboy is the second installment of The Vengeance Trilogy, preceded by "Sympathy for Mr. Vengeance"(2002) and followed by "Sympathy for Lady Vengeance"(2005). Both are great movies but this one is absolutely sublime. The film is violent and shocking but also amusing and visually stunning.

Finally, the music, a combination of classical and electronica, is simply amazing. Nearly all the music cues composed by Jo Yeong-Wook are titled after movies, many of them film noirs.
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A hugely popular and critically-acclaimed movie. A must!

More Info:
Wikipedia
IMDb

Trailer: