Gyeong-tae, the husband who is tired of sleeping with his wife, posts that he is selling his wife on a second-hand website. After reading the article, Young-sik accepts the transaction and sleeps with Gyeong-tae's wife. Gyeong-tae, who is secretly watching, gets excited when he sees his wife having sex with another man.
She's sensitive because she's suffering from sexual excitement syndrome, which is sensitive to small stimuli. She has been receiving regular counseling and treatment from her psychiatrist, "Stabilizer," to cure her illness. But her illness, which can't be cured easily, causes her to be in a difficult situation, burning hot even when she's at work...