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During a mock trial at school, a student makes a shocking discovery. Yang Jong-hoon, a former prosecutor-turned-professor, examines the crime scene.

As evidence piles up against Jong-hoon, he's interrogated by the police. On an exam, Han Joon-hwi's past trouble with the school is used as a prompt.

With Joon-hwi now a suspect in the murder case, authorities call for a second autopsy. A sudden attack places Jong-hoon's life in danger.

Back in the classroom, Jong-hoon poses his own ongoing case as an assignment topic. Facing charges from Jong-hoon, Prosecutor Jin Hyeong-u retaliates.

A student's plagiarism case seems tied to key evidence that could exonerate Jong-hoon. Kang Sol A sympathizes with a client at the legal clinic.

Ahead of his first trial, Jong-hoon finds out Kang Sol B's secret. Joon-hwi watches over Sol A as she deals with her family's unsettling neighbor.

Sol A is stunned when Jong-hoon receives a call from someone she never expected. Back in court on the stand, Seo Ji-ho shares a tragic story.

Prosecutor Jin claims to have a witness who saw Jong-hoon commit the murder. A scared and threatened Jeon Ye-seul grapples with a difficult decision.

Ye-seul struggles to find a lawyer. Kim Eun-suk banks on one of her students to own up to his actions and provide the testimony Jong-hoon needs.

Joon-hwi tracks down important evidence, but it may still not be enough to acquit Jong-hoon. The students help Ye-seul build a case for self-defense.

As the students get busy with training opportunities, Joon-hwi begins working under Prosecutor Jin. Jurors are selected for Ye-seul's trial.

After an unexpected court appearance threatens to turn the tide of Ye-seul's trial, Jong-hoon uses classroom methods to help her speak her truth.

A new arrest is made for the murder of Seo Byung-ju, but Jong-hoon has unanswered questions. The jury reaches a verdict for Ye-seul.

Speculations arise about Lee Man-ho's motives. Jong-hoon and the students suspect Byung-ju wasn't alone in his car during the hit-and-run.

Sol A grapples with financial woes and Kang Dan's sudden appearance. Malicious comments flood the students' video of accusations against Ko Hyeong-su.

As the case's loose ends tie up, the question becomes whether the law can truly serve justice. Sol A, Sol B and Joon-hwi prepare for a competition.