Hyeri and Ji-yeon are friends in the same neighborhood. They have a son to go to the army after some time. One day, Min-gu, who was playing at Jun-suk's house, sees Jun-suk's mother Hyeri in the shower and gets excited and hits her. Hyeri, who initially resisted, gave up resistance to Mingu's power, and after that day, the two develop into sex every time they have time. After a few days, Ji-yeon, who accidentally witnessed her son Min-gu and Hye-ri having sex, begins to seduce Hye-ri's son Jun-seok.

Two best friends. And their lust for each one's opponent mothers. Junhyeong and Daejin are best friends. One day Daejin’s mom visits Junhyeong who is heartbroken when he was disappointed in love. She suggests that she will teach him sex and make him a real man. Unlike Junhyeong, Daejin is popular guy to women. But he long since has fallen in love with Junhyeong’s mom. When Daejin hears Junhyeong’s parents seems to divorce, he decides to start expressing his affection to her.