Yan and Emily has been married for two years. Since Emily is cultivated in a catholic way and considers sex is a sin, their sex life is always miserable. To save their marriage, Yan hires a nobleman, K to give Emily a lesson on sex. Yan cooks up a scheme to kidnap his wife and locks her up in a castle for 3 months for the tutorial. After the training, her attitude towards sex has been changed, but Yan still unable to please her wife.