Two couples vacation together. They were friends and campus couples in college. Meeting again after the years passed sparks new attractions.

庆秀的继母智恩拥有二十岁般的美貌和性感魅力，让庆秀无法忍住对继母的爱。庆秀偶尔会偷窥父母的性生活，他对继母的欲望也愈加强烈。某日，庆秀发现继母偷偷找炮友上床，觉得自己遭背叛的庆秀，向继母提出一项提议……

Dae-sung and Jung-won have been married for two years. They are car pooling with the married couple next door. Woo-sung and Tae-hee don't interfere with each others' lives. However, these two couple don't just share cars, they share each others' wives too...

Dong-hoon moves to a new house. On the day of moving, he comes to the landlord to pick up the keys he didn't receive. He is happy to be seeing the beautiful Ji-hyeon. Ji-hyeon noticed Dong-hoon's interest. Dong-hoon had a housewarming celebration with his friend Min-soo. Ji-hyeon started to take a hold on the drunk Min-soo and then passed out in no time. The next day, Dong-hoon happily welcomes Ji-hyeon, who came to him without knowing what happened.