The story of the wicked lawyer Kang Han Soo, who files lawsuits that are previously planned and uses the feelings of wronged victims to his advantage, as he unintentionally becomes revered as a hero and a problem solver among the common people. Eventually, he matures to become a truly just lawyer.

Kang Han Soo is a skilled Joseon-era lawyer. Kang Han Soo defends and completes the law in order to revenge, but eventually becomes the people's spokesperson and hero. Lee Yeon Joo is a person who commissions a case in order to exact revenge.