His hands slip under his stepmother's panties. Her breathing gets faster under his or her touch. Twenty year-old Ki-chan lives with his father. One day Yoon-seo (Kim Jeong-ah), his stepmother comes to live together. She strives to be friendly using Ki-chan but he appraoches her a female and starts showing her that. He is strongly rejected by yoon-seo he knows that she wants him too. Their relationship turns in to something. Then 1 day, Min-jeong, who's received a beat for quite a while, discovers what's happening involving the two. The youthful step-mother fools her husband and falls in love with his son and the boy falls in love with the woman of his father. They produce a bargain using Min-jeong to be sure that she doesn't say any such thing.