I Love You, Man is a romantic comedy film in which Paul Rudd plays the role of Peter Klaven, a man who is about to get married but realizes he has no male friends to be his best man. In his quest to find a best friend, Peter meets Sydney Fife, played by Jason Segel, and their bromance blossoms. The movie explores themes of friendship, love, and self-discovery. Paul Rudd's performance as Peter is both funny and endearing, making him a relatable and likable character in the film.