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.

Carol Wan Chui-Pan
as Cheng

Tsai Chia-Hung
as Nung

Mu Szu-Cheng
as

Chen Shan
as

Keung Tai-Chuen
as

Luo Bin
as

Alan Li Hai-Hsing
as

Chan Yue-Ching
as

Wong Sai-Goon
as

Hu Hsiang-Ping
as