Accused of killing her husband, a woman is offered a way out by a mysterious stranger: in exchange for a confession in her place, she must commit murder.
An Yun Su's humble dream of a happy family life is destroyed when her husband is murdered. She struggles to prove her innocence in his mysterious death. Once in prison, Mo-eun, a mysterious figure called a witch among prison inmates due to her uncanny ability to read people, appears before the distressed Yun Su. The fateful encounter between these two women has its own repercussions, and two men relentlessly pursue the truth: Baek Dong Hun, a conscientious prosecutor who never loses his composure, and Jang Jeong-Gu, Yun Su's lawyer and a former boxer who packs a punch in each and every case.