Justice menceritakan tentang kisah seorang pengacara, Lee Tae Kyung (Choi Jin HyukO) yang membuat kesepakatan dengan iblis untuk membalas dendam. Sementara, Song Woo Yong (Son Hyun Joo), merupakan seorang pria yang rela menjadi jahat demi keluarganya
Kedua pria ini memiliki kemiripan, yakni sama-sama membuat kesepakatan dengan iblis untuk mengabulkan keinginan mereka. Lee Tae Kyung mengumpulkan kekuatan dan kekayaan dengan berurusan bersama klien-klien kelas atas. Kasus yang ia dapat biasanya berasal dari Song Woo Yong yang merupakan pemilik perusahaan konstruksi.
Terdapat serangkaian kasus, di mana beberapa aktris dilaporkan telah menghilang dan membawa Lee Tae Kyung dan Song Woo Yong bekerja sama dan terlibat dengan kehidupan serta rahasia dari orang-orang kalangan atas. Hubungan mereka berakhir saat mereka harus saling mengandalkan satu sama lain.
In modern society, there are people who are neglected and suffering. They are often involved in unfortunate events, such as industrial accidents, and end up dying. Most of the disasters could be prevented in advance with little attention. However, some companies or public organizations tend not to prepare for potential accidents because of the high cost. That’s how industrial accidents take place. Doctor Detective is a drama where medical doctors treat the patients suffering from industrial accidents and look into the truth behind the accidents. The story of the drama starts when Joong Eun, who is an enormously talented medical doctor, gets to join an undiagnosed disease center(UDC) in the middle of experiencing difficulties in her personal life. And she starts to look into her patients' diseases caused by industrial accidents and work on revealing the truth concealed by those with power.
Music producer and composer Ha Rib made a contract with the devil to trade his soul for fame. This devilish transaction brought him all the fame he could ask for, producing many hit songs. As the contract expiration draws near, he bargains with the devil for an extension. For that, he must find another person to sell the soul. Ha Rib finds a perfect candidate, but contemplates because she would have to suffer for 10 years for his selfish fame.
Eun Dong-Joo attempts to get back her stolen life. When she was 6 years-old, she was abandoned at an orphanage. She did not remember anything except her name. Despite her difficult environment, she has grown into a woman with a positive and bright personality.