Kang In-kyu, could become a professional doctor within his fourth-year resident at Myungin University Hospital but he quit the hospital job and applied for a prison duty officer.

Kang In-kyu confronts Jung-hoon, the head of the organ donation center, over the selection of beneficiaries of organ donation. In the past, Jung-hoon was the only doctor who helped In-kyu and In-Ju to receive treatment.

A pregnant woman in the prisoner's family gets into an accident while coming to visit. In-kyu discovers her and urgently gives first aid.

When the beneficiary's organ transplant fails, Jung-hoon plans to invite In-kyu to perform the surgery with a cross-transplant. However, In-kyu rejects the offer at once.

In an operating room where lawmaker Roh Sung-won's son's liver needs to be transplanted into a patient with Baek Kyung-seo, another doctor will attend when Kang In-kyu cannot come due to an emergency.

Kim Hyung-beom's acquaintance keeps finding the information about Kang In-kyu, and Kim finally finds out that the son of the person he killed is Kang In-kyu.