Doctor Shin

After a tragic accident leaves Momo brain-dead, neurosurgeon Ju Shin performs a forbidden surgery to save her.

Six months before the accident, Yong Joong learns who Ba Ra is as Ju Shin pushes Momo for marriage.

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

Ran-hee's lifeless body is taken away, and Ju-shin mourns for Mo-mo. The funeral proceeds, but those around her cannot believe she would take her own life with no apparent reason. Meanwhile, Mo-mo, 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 Mo-mo's appearance. Over a meal with Jin-ju, Ju-shin tries to gauge her feelings. Meanwhile, Yong-jung confesses his feelings to Ba-ra, and Ba-ra begins to see hallucinations of Mo-mo.

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.