Synopsis
Gi Moo-hyeok is a high-profile lawyer who goes undercover as substitute teacher Gi Kang-jae at an elite private high school to investigate the murder of a female student.
Plot
Jeong Soo-ah, a model and popular student at Chunmyung High School, is stabbed on her bed. Classmate Kim Han-soo is seen hovering over her body with a bloody knife. Gi Moo-hyeok, an ace lawyer with the prestigious Songha law firm, is assigned to defend Kim Han-soo. Songha has been retained by Chunmyung High School, which is more interested in settling the case quietly to preserve its public image than in discovering the truth. Gi Moo-hyeok tries to persuade Kim Han-soo to take a plea deal, admitting to the murder in exchange for a lighter sentence. Han-soo refuses, and claims that he is the victim's boyfriend. He is more concerned about Soo-ah's condition than his own legal plight.
Lacking Kim Han-soo's cooperation, Gi tries to create reasonable doubt during the trial by revealing a photo that suggests that Jeong Soo-ah is an escort and that any of her male clients could have attacked her. The stunt enrages Kim Han-soo, who causes a ruckus and claims that he did stab Jeong. Gi's case collapses after Kim Han-soo attempts suicide after he receives a mysterious visit, and he falls into a coma. Jeong Soo-ah dies from her injuries and Kim Han-soo is charged with murder. Gi Moo-hyeok’s career crashes as he is fired from Songha and his license to practice is suspended.
In order to regain his reputation as a lawyer, Gi obtains a temporary teaching job at Chunmyung under an assumed name, Gi Kang-jae. As Gi Kang-jae, he clashes with Ha So-hyeon, the school's phys ed teacher and counselor, who is too earnest and naive to believe that her students are capable of the physical and online bullying that Gi encounters early on. Eventually, the two team up to uncover the Veritas Club, a secret society of privileged students who control teachers and fellow students to burnish their school records.
Can Gi Moo-hyeok and Ha So-hyeon solve the murder case and exonerate Kim Han-soo?
