Following the case of the murder of a professor at South Korea's top prestigious law school, professors and students become suspects in the murder.

Ma Hye Ri is a woman with an excellent memory and ability to focus, which allowed her to pass the bar exam with ease. Despite her talents, she is more interested in being fashionable and dislikes hard work, so she is far from being an ideal prosecutor and has doubts about her suitability for her job. Through her conflicts with senior colleagues and struggles with difficult cases, however, Hye Ri gradually matures into a brilliant prosecutor with a sense of duty and justice.

Critically lauded drama about the life and pressures of a group of students at a prestigious Eastern law school, with a strict and domineering contract-law professor named Charles Kingsfield, who alternately inspires and terrifies the students.