Watch Fulltime Killer for Free: How to Stream the Movie Online at 123Movies. . Professional assassin O has resided in an isolated world of killing and loneliness. But his life begins to change once he meets the innocent Chin; hired to clean O's apartment. However, soon the flamboyent and reckless Tok enters Chin's life with a mission to unveil O's identity and usurp his place as the number one sharp-shooting assassin in the game.