Kwong is a mafia king. When a rival gang steals a rare chinese artifact from him, he blaims his two "bag-men" and threatens to "cut their life" if they don't recover the treasure.
Black Butterfly tells the story of a female assassin who is sent to Taiwan to clear the way so a gang from Hong Kong can take over the territory. Problems arise when she breaks the cardinal rule of an assassin -- never develop friends -- and she cannot complete the job. Now hunted by both camps, the killer must turn into a savior as she tries to help her friends.