Yes, "Infernal Affairs III" is the final film in the "Infernal Affairs" trilogy. Released in 2003, it serves as both a prequel and a sequel to the first two films, concluding the story of the undercover cop and the mole in the police force. The trilogy is highly regarded for its gripping narrative and complex characters, and it has influenced various adaptations, including Martin Scorsese's "The Departed."

Yes, "Infernal Affairs" is a trilogy consisting of three films: "Infernal Affairs" (2002), "Infernal Affairs II" (2003), and "Infernal Affairs III" (2003). The series follows the intense cat-and-mouse game between an undercover cop and a mole in the police force, delving into themes of identity, loyalty, and morality. The original film was critically acclaimed and inspired the Hollywood remake "The Departed" (2006). Each installment builds upon the story and characters introduced in the previous films.

"Infernal Affairs III" serves as both a prequel and sequel to the first film. It explores the aftermath of the events in "Infernal Affairs" and delves deeper into the characters' backgrounds, particularly focusing on the psychological toll of their dual lives. The narrative intertwines with flashbacks and parallel storylines, revealing how the choices made by the characters in the first film continue to impact them. The film also introduces new characters that enhance the original storyline, creating a complex web of loyalty and betrayal.

"Infernal Affairs III" continues the story of the undercover cop, Lau Kin-ming, and the mole in the police force, Chan Wing-yan. Set after the events of the first two films, Lau tries to cope with the aftermath of the previous conflicts while dealing with the fallout of his dual life. The film introduces new characters and explores themes of loyalty, betrayal, and the psychological toll of undercover work. As tensions rise, both men face their past decisions, leading to a suspenseful conclusion that ties up loose ends from the trilogy.