Chuen jik sat sau (2001)

For many years professional assassin O has resided in an isolated world of killing and loneliness, which only becomes worse after the death of his love, Nancy. But his life begins to change once he meets the innocent Chin. 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.