Her Secret Lesson: Jincheol and Hyejeong are lovers. However, both of them are bad at sex and are disappointed in each other. Hye-jeong says goodbye to Jin-cheol. Jin-cheol recommends that her friend Kyung-soo be taught that there is a god of sex. Yoon-il, the god of sex, accepts Jin-cheol and gives him great training. The innate premature ejaculation Jin-cheol begins to improve little by little. Jin-cheol has been reborn as a bun-gang-so through actual battles with female assistants. He proudly goes to meet Hye-jeong. Jin-cheol satisfies Hye-jeong with great energy.