Doctor Shin

Top star Momo falls into a coma after an unexpected accident. Her mother, Ran-hee, proposes a shocking solution to Momo's lover, neurosurgeon Ju-shin, to transfer Momo's soul into her own body through a brain transplant. Although it is a dangerous gamble, Ju-shin makes the fateful decision to perform the surgery.

Six months before Momo's accident, Yong-joong learns that Ba-ra is the child he met 16 years ago. Meanwhile, Ju-shin pressures Momo to marry him. Although she resists, Ju-shin sends expensive pieces of jewelry and promises to take responsibility, leaving Momo increasingly torn despite her mother's strong opposition.

Momo goes missing after a scuba diving accident. Ba-ra, a journalist, senses something suspicious about the case, while Yong-joong also feels an unsettling vibe from Ju-shin. Meanwhile, Ba-ra reveals the engagement of Ju-shin and Momo in an exclusive interview without informing him, as Momo calls 911 to report her mother's death.

Ran-hee's lifeless body is taken away, and Ju-shin mourns for Momo. The funeral proceeds, but those around her cannot believe she would take her own life with no apparent reason. Meanwhile, Momo, who now carries Ran-hee's soul, pretends to mourn while contemplating the possibilities of her new life.

Ju-shin begins to feel a growing sense of unease toward Ran-hee, who now has Momo's appearance. Over a meal with Jin-ju, Ju-shin tries to gauge her feelings. Meanwhile, Yong-joong confesses his feelings to Ba-ra, and Ba-ra begins to see hallucinations of Momo.

Ran-hee grows increasingly irritable as she tries to get closer to Ju-shin. However, Ju-shin seeks out Jin-ju, shows interest in her, and urges her to undergo the surgery. After meeting Gwang-cheol, her supposed biological father, Jin-ju vanishes without a trace, leaving behind only a single letter that shocks everyone.