课外授业：即将成熟

Haneda and Jeong-won are a married couple. He looks faithful, but one day Haneda witnesses Jung-won having an affair in the hospital. She attempts to kill him, but he becomes paralyzed. A few days later, Haneda tries to unsuccessfully kill herself, but her heart might stop any day so she takes advantage of her stationary husband.

Yonggyu and Taejun, who shoot an experimental documentary about the effects of sex on dieting, once a day with one woman! Twice a day with two women in the second week! And 3 times a day !!! No nationality, no marriage, no past?! The experiment of three weeks' reckless experiment with 6 experimental participants is unfolded. What is the end of this imaginative project?

Campus couple Tae-ho and Eun-seo join the same graudate school to sit in lectures for the most powerful person in Korean journalism, Lee Hee-hyun. On the first day of school, Lee Hee-hyun takes a liking to pretty and smart Eun-seo and uses his authority to try and seduce her, but fails. Hye-jin realizes what the professor is trying to do and spends a night with him, getting herself to the syposium. Eun-seo questions the result and asks Lee Hee-hyun for an explanation. He asks her for physical pleasure and Eun-seo is just confused...

Three married women had always been dissatisfied sexually with their husbands, and Hyoji, who recently divorced due to her husband's erectile dysfunction. They gathered after a long time and had a drink complaining to each other, and they received a business card from an unidentified handsome man, saying, "Don't you want to play tteok pounding game?" The four of them head to the meeting place and meet suspicious agents who were waiting for them.

Having been happily married to Jae-hyun, Na-yeon accidentally learns about Jae-hyeon's wishes from her former sex partner Min-woo. Na-yeon, who is a little nervous after hearing Min-woo's words, confirms with Jae-hyeon and spends another night with Min-woo in anger. Min-woo, who had long been interested in Na-yeon, now begins to approach her as a real man, not as a sex partner, and she begins to open her heart little by little. The love story of two men surrounding a woman is just beginning.

Set in the wilderness of Hokkaido, the story of a couple in their 30s and a couple in their 20s is drawn, and the subtle emotions of the two men and women are depicted with intense Eros and delicate images under the theme of marriage exchange.

Yoon-hee, Hye-kyeong, In-chang and Sang-joon get together for the first time in a while one winter. The men pay more attention to the girls than snowboarding. After a day of fun-filled snowboarding, the four of them drink all night. In-chang and Sang-joon give the women tips on the sport, and everything is well. The beer runs out, and Sang-joon and Yoon-hee head to the store together, while In-chang and Hye-kyeong stay behind. Led by lust, they start creeping up on each other.

A bar exam student and the tutor relieve each others' sexual passion and love

The sister-in-law is young and attractive. She imagines having secret sex with her brother-in-law. The 23-year-old lives with her sister and her husband. She's witnessed them having sex once and now imagines her brother-in-law and his naked physical body. One day, she is introduced to a date by her brother-in-law. The date is himself. He planned on taking her out one day to cheer her up. She imagines having sex with him but she knows it's not possible and writes it down her on Bucket List. What will happen to her love for him?

Ji-seon is living with her sister and her husband after a divorce. Her sister Ji-yeong leaves for a work trip and Ji-seon is at home all alone with her brother-in-law. The two can't hide their sexual passion and they cross the line. Every time Ji-yeong leaves, the two enjoy risky sex...

Joo-man starts an affair with the younger Jin-nyeo and drives out his wife, Soon-jeong. Soon-jeong, who was kicked out to an empty house, meets a robber, Do-sik. At first, she was bullied by Do-sik, but she turned it around and began abusing him instead. Do-sik suddenly falls in love with Soon-jeong, and the two eventually plot to kidnap Joo-man and Jin-nyeo.