Han Yi Han was an elite surgeon. He graduated at the top of the best medical school in South Korea and he specialized in two departments: general surgery and cardiothoracic surgery. One surgery changed his life. Han Yi Han believe he did well on that surgery, but the patient died. He then got his medical license revoked. Four years later, Han Yi Han works as a lawyer, specializing in medical litigation. He also tries to uncover the truth behind the death of his former patient. For his trials, Han Yi Han defends victims and tries to punish those that commit medical malpractice and negligence. He works with a public prosecutor, who lost a family member and a lover due to the surgery Han Yi Han performed.

Min-jae who is a policeman from generation to generation has been ordered to investigate Kang-yoon secretly, who is the ace team leader of investigation team. Min-jae is appointed as the member of Kang-yoon’s team. Min-jae has belief of “If the police do something illegal even it has been occurred during the process of investigation, he is also a criminal.” But while Min-jae investigates Kang-yoon, he begins to resemble Kang-yoon who has belief of “The chase of crime should be justified even it’s illegal.” Will Min-jae be able to clear his private mission and arrest Kang-yoon that he trusts and admires?