Based on a book by Hong Kong filmmaker Pang Ho-cheung, Fulltime Killer protagonist O is a hitman being challenged by new hotshot Lok Tok-wah.

The woman living at his contact address is captured after O foils a set-up by his boss.

The last part of the movie focuses on an Interpol detective's attempt to write the story of Tok and O.

This was supposedly done as per special request to show that "Crime doesn't pay".

[citation needed][3] On 29 March 2004, DVD was released by Tartan Asia Extreme at the United Kingdom in Region 2.