It’s Yu-ri’s first day at Law Firm Daejeong, 1 of Korea’s top 3 law firms. She thought she’d be joining the corporate department, but instead, she was assigned to the divorce department. Eun-kyung, the nation’s divorce attorney, instantly knows that Yu-ri isn’t the right material for a divorce attorney. However, Yu-ri tries to win the case in her own way.

Yu-ri’s straightforward nature struggles to comprehend some of the methods Eun-kyung employs. She is particularly shocked when she sees Eun-kyung persuading her clients to prioritize economic benefits over child custody. To Eun-kyung, who possesses far more experience than a novice, Yu-ri is just a rookie in the big leagues. What astonishes Yu-ri even more is Eun-kyung's reaction after she reveals a little secret she’s discovered.

Yu-ri is surprised to hear that Eun-kyung doesn’t want to divorce Ji-sang even after finding out about his affair with Sa-ra. Yu-ri finally starts a session with a client on her own and gets her first case. However, the client decides to drop the lawsuit. Yu-ri decides to quit working for the divorce team.

Eun-kyung asks Yu-ri to represent her for her divorce case against Ji-sang. Eun-kyung sends a letter of complaint to Sa-ra, letting everyone in the office know that she was involved in an unsavoury incident. Rumours about Eun-kyung and Ji-sang’s divorce circulate, but Eun-kyung doesn’t even bat an eye.

Ji-sang secretly leaks to a reporter that Eun-kyung might have an office husband and that she had an affair before him. Yu-ri decides to hear whether Eun-kyung and Woo-jin had an affair or not. Yu-ri convinces Eun-kyung to settle, but Eun-kyung doesn’t give in. Meanwhile, Yu-ri comes up with a brilliant idea to change the public’s opinion of Eun-kyung.

The first hearing of Eun-kyung and Ji-sang’s divorce trial begins, and neither side wants to give up the custody of Jae-hui, their daughter. Jae-hui misunderstands Eun-kyung’s intention and thinks she wants to let her live with her father. Meanwhile, Yu-ri takes on a case of a couple who want to give up their custody.

As soon as Sa-ra gets promoted to chief manager, she gets dismissed from the law firm. Ji-sang tells Sa-ra that he has no intention of marrying her even if he gets divorced, which leaves her devastated. Meanwhile, Yu-ri’s stepmom comes to see Eun-kyung and threatens her to fire Yu-ri.

Sa-ra is pregnant with Ji-sang’s child. However, Ji-sang’s lawyer advises him to abandon Sa-ra to win custody of his daughter. Sa-ra secretly puts the ultrasound picture of her baby in Jae-hui’s room, and Jae-hui eventually sees it. Meanwhile, Jae-hui finally meets the family investigator.

Eun-kyung finds out that Jae-hui knew about her dad’s affair with Sa-ra even before she did. Ji-sang breaks up with her after hearing what Sa-ra did to Jae-hui. Eun-kyung becomes emotional after finding out about Sa-ra’s pregnancy and what she did to Jae-hui. Hence, Yu-ri looks for a way to calm her down.

Jae-hui confides in Yu-ri that she wishes her parents’ divorce trial to end soon so that everyone can move on. She also chooses to live with Eun-kyung instead of her father and lets him know how much his lies hurt her. Meanwhile, Sa-ra miscarries her baby, and her relationship with Ji-sang ends.

Mr. Oh suggests Eun-kyung to go on a vacation and resign once she returns. Eun-kyung decides to go on a trip with Jae-hui, but things don’t go too smoothly. The Divorce Team gets twice as busy with Eun-kyung gone. Meanwhile, Yu-ri takes on a case and solves it on her own for the first time.

Daejeong signs an MOU with Chun Medical Foundation and takes a divorce case from its chairman, Chun Hwan-seo. Mr. Oh assigns the case to Yu-ri instead of Eun-kyung, and Yu-ri learns from him that he intends to fire Eun-kyung soon. Meanwhile, Eun-kyung finds out that Woo-jin will become the managing partner of Daejeong.

Chun Hwan-seo calls Eun-kyung to his house, and she finds his wife unconscious on the floor. Yu-ri, who was waiting outside the house, calls the police when she doesn’t hear from Eun-kyung. Meanwhile, Woo-jin comes up with a plan to deal with the mess Chun Medical Foundation put Daejeong into.

Eun-kyung decides to leave Daejeong and open up her own law firm. Although she starts out with a big ambition, it doesn’t turn out as well as she expected it to be. Yu-ri is given a choice to switch teams, but she hesitates. A new client visits Eun-kyung, but she sends her to Yu-ri, and Yu-ri does the same for Eun-kyung.

Eun-kyung realizes that Yu-ri is the opposing counsel of her new client. They meet up to discuss a settlement, but they faila to find the middle ground. Eun-ho decides to leave Daejeong after much consideration and joins Eun-kyung’s new firm. After Eun-ho leaves the firm, Yu-ri realizes how much he meant to her.

A year passes and Oh Dae-gyu's wife, Park Ae-yeon, files for divorce at Law Firm Daejeong, and Woo-jin assigns Yu-ri to take the case. Flabbergasted at facing his own company against him, Dae-gyu asks Eun-kyung to represent him. As Yu-ri and Eun-kyung try to settle outside the courtroom, Dae-gyu has a sudden change of heart. Meanwhile, Eun-kyung thinks of letting Jae-hui spend time with Ji-sang.