As an ace attorney at a big law firm, No Chak Hui is willing to take any risk to win a case and is set to receive a promotion to a partner position, but a problem occurs on a case she accepts. Because of the case, she is suspended for a year. She then begins to start work as a public defender but hopes to return to her position at the law firm where she worked previously. As a public defender, she shares an office with fellow public defender Jwa Shi Baek, a top graduate of the Judicial Research and Training Institute. Instead of becoming a judge, prosecutor, or attorney at a big law firm, he chose to work as a public defender. He is enthusiastic about his work but also has a mysterious part of his personal life that nobody knows about. No Chak Hui and Jwa Shi Baek don't get along very well, but a serial murder case brings them together, and as they try to solve the case together, more secrets unfold, and they grow to trust each other. (Source: AsianWiki, edited by Nauriya)