A father-in-law who has come to live with his son and his wife. He is attracted to his son's kind wife Hana and ends up raping her! Hana is unable to resist her father-in-law's obsessive advances and is forced to do all sorts of obscene acts even when her husband is nearby. Hana is forced to do training sex as if to compete with her son, and before she knows it, she is addicted to it...