Cha Yeong-min, the most on-demand heart surgeon at Eunsang University Medical Center, meets his match when a well-connected newcomer joins his team.
An out-of-body experience compels Ko Seung-tak to take the lead in the operating room. Everything goes awry when he comes to his senses.
When a VIP patient suffers severe post-surgery side effects, a conference is called to determine who's to blame. Yeong-min has a culprit in mind.
A strange partnership between Yeong-min and Seung-tak begins. Meanwhile, Yeong-min learns that a trusted colleague was engaged in a malicious scheme.
Word of Seung-tak's talent spreads, putting him in a precarious position. A patient suffers roadblocks as Yeong-min is unavailable to treat him.
Yeong-min and Seung-tak form a pact to keep up the act long enough to save a few more lives. On the day of an important surgery, Yeong-min faces delays.
While observing notes written by two separate doctors, An Tae-hyeon spots uncanny similarities. Yeong-min signs up to operate on his favorite celebrity.
The witness and perpetrator of Yeong-min's accident wakes up with no recollection of the spirit world. Jang Gwang-deok prepares for his final days.
To convince Han Seung-won, Tae-hyeon decides to find proof of his outrageous theory. Seung-tak heads to a library to find a book for a ghost.
After finding out the haunting secret, Seung-won keeps Seung-tak from performing any more operations. Oh Seung-jo falls into a coma.
Jang Se-jin puts up a wall between her and Seung-tak. Meanwhile, her half-brother drops by to claim his share of the inheritance.
After passing out in her office, Se-jin takes a few days off with Seung-tak by her side. Seung-won persuades Tae-hyeon to finish a job.
A traumatized Seung-tak disappears after leaving the hospital. Seung-won assigns another doctor to perform surgery on Yeong-min.
After making a grand comeback, Seung-tak asks Yeong-min to teach him how to be a good doctor without needing to be possessed by a spirit.
Yeong-min learns that the surgery that could help him wake up comes with a critical side effect. He gives an out-of-work doctor a second chance.
Days prior to the operation, Yeong-min and Seung-tak prepare for every possible scenario, hoping to leave nothing to chance.