Si Mun, when he was just a boy and the grandson of a renowned shaman, possessed the gift of being able to see and engage with ghosts. To rid him of this ability and the memory of the exceptional happenings he had experienced, his grandmother gifted him a talisman.
Time has elapsed, and Si Mun now leads a busy and uneventful life as a detective for the Korean police, having bid farewell to his grandmother, who has moved on. Nevertheless, it appears that the powers she locked away are resurfacing within Si Mun once more.
