A story of a young prosecutor who has suffered a new opportunity to realize justice again. Adapted from a web novel of the same name.

After the public rates the judicial system corrupt, the Devil Judge is appointed to live stream his trials. A reformist judge is hired as a secret mole to keep an eye on him.

Do Min-Ik works as a director of the mobile media 1 team at T&T. He is smart and excellent at his job. His secretary is Jung Gal-Hee. Do Min-Ik often does childish things like calling Jung Gal-Hee continually. Jung Gal-Hee carries out Do Min-Ik's orders without complaints. She looks soft, but she hides her tough side.

While investigating a serial murder case, Han Tae Joo gets into an incident. When he wakes up, he finds himself back in 1987. To get back to his present world, he must solve the murder case.