The young Chief Justice of the Supreme Court, Shi Xian (Ji Jin-hee), is not only successful in his career, but also has a beautiful wife and a lovely daughter. However, everything has changed since he received a mysterious phone call at his promotion celebration party. First, his wife was killed strangely, and then he met a female reporter who told him about the "parallel theory" and warned him that his life would be "parallel" to Judge Han Sang-jun, who was exterminated 30 years ago, which foreshadowed that he and his daughter would soon encounter misfortune. The person in charge of investigating the murder of Shi Xian's wife is Shi Xian's college classmate Jiang Cheng (Lee Jong-hyuk). After investigation, they targeted the criminal on a person named Zhang Xiuying (Ha Jung-woo) and quickly caught him. Zhang Xiuying confessed to the crime, but Shi Xian determined that Zhang Xiuyong was not the murderer who killed his wife based on some details. The female reporter was killed, and Zhang Xiuying, who was locked up in the police station, escaped. A series of events were not only strikingly similar to the extermination of the family 30 years ago, but also had exactly the same date. Shi Xian, who was shrouded in the shadow of fate, began to try to uncover the secrets behind the "parallel theory" to redeem himself and his daughter's life...