Main •
Jung Ryeo-won as Ma Yi-deum •
Yoon Hyun-min as Yeo Jin-wook •
Ji Min-hyuk as young Jin-wook : He is a newbie prosecutor who graduated from law school at the top of his class. He takes no interest in promotion, success and office politics. He used to be a pediatric psychiatrist, so he is able to distinguish truth and falsehood by finding the subtle nuances and hidden clues in people's testimonies, which is a useful ability for solving sex crimes, which always lack physical evidence. At first, he is not fond of Yi-deum, who pursues power without reserve, but when he learns about her painful past, he holds out his hand to her and protects her. •
Jun Kwang-ryul as Jo Gap-soo : As his father was a left-wing activist under the right-wing government, he was not able to become a prosecutor. Instead, he became a policeman. Whenever he had a chance of getting promoted, his father's record would always drag him down, so he accused innocent people as communists to show his loyalty for the government. Yet, he holds no regret or shame for the terrible things he's done. After retiring as a chief officer, he is elected as a member of the National Assembly. He is a member of the advisory board of a law firm, and he runs for the position of mayor of Yeong-pa city. •
Kim Yeo-jin as Min Ji-sook : She is the chief prosecutor of the special task force for sex crimes against children and women. She created the task force herself to help the victims more efficiently. 20 years ago, she investigated the sexual torture case of Superintendent Jo Gap-soo. She desperately wanted to punish him but failed due to lack of evidence. After 20 years, she is still fighting against Jo Gap-soo's law firm at the court. •
Kim Jae-hwa as Son Mi-young •
Yoon Kyung-ho as Goo Seok-chan
Brother Law Firm •
Heo Sung-tae as Baek Sang-ho •
Kim Min-seo as Heo Yoon-kyung, an ace lawyer who does anything to win •
Go On as Ahn Tae-kyu
Others •
Lee Il-hwa as Kwak Young-sil, Yi-deum's mother • as Jang Yoo-mi •
Jo Woo-ri as Jin Yeon-hee •
Kang Kyung-hun as Sun Hye-young •
Park Doo-shik as Kim Dong-shik •
Jung In-seo as Yoon Ah-reum •
Kim Kwon as Baek Min-ho • Kim Ji-eun as Chairman Ahn's secretary •
Im Kang-sung as Yoon Min-joo •
Jeon Bae-soo as Oh Soo-cheol •
Jung Jae-kwang as Prosecutor Yun ==Production==