The One Hundred Thirty-Ninth Night summary: In a remote mountain village called "Cheonuri," a mysterious creature known as a "Dokkaebi" (a supernatural being) resides. After the death of her grandmother, her only family, Seunghyo decides to visit a rural health clinic in Cheonuri to soothe her empty heart. Upon arriving in the village, Seunghyo gets lost and meets a village youth named Bong. Although he helps her, his cold and mysterious demeanor leads him to advise her to leave the village as soon as possible.