Mok is the son of a Cho-Sun noble. While accompanying his father to the capital, he sees a strange man without feet. Back home, he becomes severely sick. The mysterious man, who is none other than a ghost, guides Mok through his fever and reveals to him that he's protected by four divine spirits. Mok learns that he is gifted with the ability to see the world of spirits and ghosts. Since then, whether he likes it or not, Mok intervenes to settle spirit-related phenomenona...