Oldboy is a Korean film and a revenge thriller.
A man is kidnapped on the day of his daughter’s birthday and imprisoned for 15 years. Then he is released suddenly and equipped with money and a cellphone. As he looks for his kidnapper, we learn the background story.
It is an interesting movie, but I saw the main plot twist miles away. Amber had no inkling about it. So that reduced my enjoyment of the movie somewhat. Because of this, I am going to rate it only 6/10.
It also has an ambiguous ending and you would find lots of people arguing about what it means.