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-sin, to transfer Momo's soul into her own body through a brain transplant. Although it is a dangerous gamble, Ju-sin 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-sin pressures Momo to marry him. Although she resists, Ju-sin 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-sin. Meanwhile, Ba-ra reveals the engagement of Ju-sin 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-sin 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.