The Witch: Part 1. The Subversion

A young girl escapes from a mysterious laboratory after a violent incident that leaves many dead. Two members who run the lab, Dr. Baek and Mr. Choi, considered her dead. The girl collapses on a farm, where she is discovered by the owners, Mr. and Mrs. Goo. His wife nurses the girl back to health and adopts her.

10 years later, the girl, named Ja-yoon, is living a normal life, apparently without any memory of her past. Her family is struggling financially, her mother is showing early signs of dementia, and Ja-yoon is suffering periodic, severe headaches. To earn money, she decides to audition for a national singing contest that promises a large cash prize. She impresses the judges with her special talent - the telekinetic ability to make the microphone levitate. This makes Dr. Baek and Mr Choi realize that Ja-yoon is the girl who escaped and they send men to recapture her.

On her way to Seoul for the second round of the audition, Ja-yoon is approached by a man named Nobleman, who claims to know her. After the audition, she avoids an abduction by Dr. Baek's men. A group of armed men barges into her home and holds her family at gunpoint. Seeming to enter a trance, Ja-yoon dispatches the men with superhuman strength and speed. She is left shaken, apparently not understanding either her superhuman or psionic abilities. Nobleman demands that she accompany him or he will kill her parents. She agrees and is taken to the laboratory, where she is restrained.

Dr. Baek explains that she created Ja-yoon, genetically modifying her to have superpowers. Ja-yoon's headaches are a symptom of a disease that will kill her without proper treatment. She has her injected with a blue serum that will stop the disease for a month, leaving Ja-yoon dependent on new doses. After the injection, Ja-yoon's demeanor changes and she reveals the truth - she never lost her memory and has always known what she is. After visiting a doctor by herself and being told that without a bone marrow transplant from a blood relative, she only has a few months left to live, she decided to track down Dr. Baek for the cure. Not knowing how to find her, she purposefully revealed her abilities during the audition to draw the attention of her creators.

With the serum restoring her to full strength, Ja-yoon escapes her bonds and kills her guards. Holding Dr. Baek at gunpoint she demands to know where the serum is produced. It is around this time that Mr. Choi comes, having heard about Ja-yoon, but she kills him with ease. She defeats the Nobleman but Dr. Baek is killed during the chaos. Ja-yoon burns the building down and visits her parents, providing her father with some of the serum to give her mother to help slow the spread of her dementia. Her father alludes to always having known what Ja-yoon could do.

Three months later, Ja-yoon appears in the home of Dr. Baek's twin sister. She gives her more vials of the serum. A mysterious young woman, whose face is covered in scars, approaches Ja-yoon but Ja-yoon threatens to kill her if she touches her and the screen goes to black.

• Kim Da-mi as Ja-yoon^[11]
• Jo Min-su as Dr. Baek^[12]
• Park Hee-soon as Mr. Choi^[12]
• Choi Woo-shik as Gwigongja (Nobleman)^[13]
• Go Min-si as Do Myung-hee
• Choi Jung-woo as Teacher Goo
• Oh Mi-hee as Teacher Goo's wife
• Kim Byeong-ok as Police Officer Do
• Jung Da-eun as Ginmeori (Girl with long hair)
• Lee Joo Won as CEO Sung

In June 2018, it was reported that Kim Da-mi, Jo Min-su, Choi Woo-shik and Park Hee-soon were starring in the film. Kim Da-mi was selected from 1,500 candidates to play the role.^[14]