This story about assassins takes place in a fanciful world. Yim Mo, who used to have a prestigious nickname 'Yama', has caused his family to be ruined due to a blunder. He ends up as a mediocre killer. His downfall led to the rise of the legendary assassin, Kiu Sing, aka Zero. Their destinies soon end up being re-written when an 'Assassin Hunter' appears and forces Yama and Zero into a life or death confrontation.