To his shock, Mu-jin still encounters vengeful spirits and is even more stunned by the fine print in his six-month contract. His next case involves Cho Eun-young, a nurse consumed by revenge. Not only does she terrify him, but she also takes control of his body, unleashing chaos in the hospital as she hunts down those responsible for her death.

Mu-jin and his team look for evidence to reclassify Nurse Cho Eun-young's suicide as an industrial accident, aiming to hold the hospital accountable for covering up suspected workplace bullying and medical malpractice. However, with Mu-jin blacklisted from the hospital, it falls to Gyeon-woo to infiltrate the facility and locate the one piece of evidence Mu-jin remembers seeing while possessed.

Mu-jin's father suspects his mother of having an affair and asks him to investigate. When Mu-jin visits, he encounters a ghost, a close friend of his mother, seeking justice. Following his mother to her university, Mu-jin uncovers a mysterious test that may explain the ghost's tragic death.