The movie begins with Lucy, An American woman, who is 24 years old. She is studying in Taipei. The Woman is brought into a big trouble, by her boyfriend who tricks her and makes her a part of the drug deal. Her new boyfriend deceives her into working as a drug mule. Mr. Jang is an employer of the mule and is a mob boss from Korea and he is a drug dealer too.
Lucy is made to deliver a briefcase to this man. The briefcase was filled with an extremely precious and valuable synthetic drug, CPH4. She becomes the witness of the murder of her boyfriend and she is caught by the captors. The criminals sew a bag of drug into her abdomen. One of them kicks her hard in the abdomen and the bag of drug breaks, releasing the drug into her body. She acquires enhanced mental and physical abilities, she turns the tables on the criminals and changes into a cold hearted Warrior.