In Korean folk traditions, "seire" is the twenty-one days after a baby is born in which they're uniquely vulnerable to bad luck, curses - even evil spirits. Many superstitions surround these first three weeks in a baby's life, and new mother Hae-mi carefully follows every one of them. Father Woo-jin is reluctantly willing to play along, but when he attends an ex-girlfriend's funeral, he unwittingly opens the door to to dark supernatural dangers. Plagued...