Park Chan-wook's Vengeance Trilogy, which is an informal series rather than a continuous story. Sympathy for Mr. Vengeance, Oldboy and Sympathy for Lady Vengeance share no characters and no plot; Park grouped them himself, and they are sold, screened and written about as a set. What makes them one thing: each follows a person who carries out a revenge in full and finds that completing it destroys them, filmed in the same register of long takes, sudden violence and black comedy, and each ends by handing the audience a moral position it cannot comfortably hold.