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