In 1426 in Joseon, a year after her father vanishes while investigating the disappearance of thirteen girls, eighteen-year-old Min Hwani returns to the island of Jeju to pick up his trail with the help of her estranged sister.

In Joseon Dynasty-era Korea, sixteen-year-old Seol, an indentured servant within the police bureau, becomes entangled in a politically-charged investigation into the murder of a noblewoman.