Fulltime Killer is a 2001 Hong Kong action thriller directed by Johnnie To and starring Andy Lau and Takashi Sorimachi. The film follows O, a highly skilled and successful hitman who becomes infatuated with Chin, a beautiful cleaning woman he meets in his apartment building. Chin is unaware of O's true profession and believes him to be a successful businessman.
Meanwhile, Tok, a younger and arrogant rival assassin, becomes obsessed with defeating O and takes it upon himself to uncover O's identity. He begins to follow Chin, hoping to use her as a way to get closer to O.
As Tok and O's competition heats up, the two assassins engage in a series of increasingly violent and elaborate showdowns. The film features intense shootouts, daring stunts, and stylish visuals, as well as a melancholic undercurrent as O begins to question the solitary life he has lived as a killer.
Fulltime Killer was acclaimed for its stylish direction, sharp dialogue, and strong performances from its lead actors. It has since become a cult hit and a staple of the Hong Kong action genre.