Seire plot
According to an old belief from Korean folklore, relatives should never go down an evil path when their child is born, as this could lead to a curse. To Woo-jin, this is all nonsense and he doesn't care, despite his wife's hesitations. He decides to attend the funeral of a former love, Se-young. Once there, he meets Ye-young, the twin sister of the deceased, whose existence he strangely did not know. She tells him that her sister had a hard time getting over their breakup and something seems to have broken inside her. When he returns, Woo-jin and those around him experience strange paranormal phenomena.