Han Yihan performs a heart transplant for Seokju, the brother of his girlfriend, Seokyeong. He gets a secretive call from the director of his hospital just after completing a successful operation.

Seokju dies from the surgery that was supposed to be successful; Yihan grapples with his death and struggles to find the truth, but with no one standing by him, he has no choice but to go on trial.

Five years later, Yihan returns to court as a lawyer for his former colleague; a son of the hospital's director holds a robot surgery demonstration.

Kitae dies suddenly and Yihan suspects the Banseok University Medical Centre is involved; Jayden develops a crush on Hyunseong's fiancé.

Soyeon, an aspiring idol, claims she is a victim of a ghost surgery after she loses her voice post-surgery; a lawyer at Banseok University Medical Centre pays a visit to the law office.

Yosub shows up as a witness for Soyeon's case, apologising and testifying in court; Yuna, Taemoon's daughter, is promoted to director of Banseok Research and Development Centre.