In 1724, during the Joseon Dynasty, a beautiful 18-year-old commoner girl named Gayoung was renowned for her looks in the local area. One day, Minwoo, from a noble family, saw Gayoung passing by on the street and ordered his slave to abduct her to a mountain house. Tormented by shame, Gayoung hanged herself on the spot and became a ghost, turning the place into a haunted house. Three hundred years later, a police station is built on that site, and Minwoo is reincarnated as Detective Kim. Gayoung, now a ghost, seeks revenge on Minwoo, but it's not easy. Through Minji, who is arrested for drug trafficking, she finally achieves her revenge after 300 years.