The Vengeance Trilogy (Korean: 복수 삼부작) are three films, Sympathy for Mr. Vengeance (2002), Oldboy (2003), Sympathy for Lady Vengeance (2005), directed by South Korean film director Park Chan-wook, which dealt with the themes of "revenge, violence and salvation".
After being wrongfully convicted, a woman is imprisoned for 13 years and forced to give up her daughter. While in prison she gains the respect of her cellmates and plots her revenge on the man responsible. Once released, she begins her elaborate plan of retribution, but discovers a horrifying truth.
With no clue how he came to be imprisoned, drugged and tortured for 15 years, a desperate businessman seeks revenge on his captors.
A deaf man and his girlfriend resort to desperate measures in order to fund a kidney transplant for his sister. Things go horribly wrong, and the situation spirals rapidly into a cycle of violence and revenge.