Cheng Li-sheung is a young, upwardly mobile professional finally ready to invest in her first home. But when the deal falls through, she is forced to keep her dream alive - even if it means keeping her would-be neighbors dead.

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.