Unlike Seok-ho, who is happy to meet you, Jeong-hun is uneasy about Su-jin's wife, Sujin. This is because he liked Sujin in the past but couldn't confess because of his seniors. A few days later, Jeong-hun and Su-jin visited the house at the invitation of a senior and reunited after a long absence. They talk alone to confirm their feelings for each other and to share their hot love affairs...

The story revolves around four friends who decide to get back to studies, after a gap of fourteen years. But, what happens when four of them unravel a mystery which was underneath for long time?

Four college seniors open a bogus sex clinic, which unexpectedly mushrooms into a multi-million dollar business.

High school classmates So-ra and Ha-neul go to a pension with their boyfriends Sang-woo and Si-hoo. On the first night at the pension, So-ra's drunk boyfriend Sang-woo enters the wrong room and ends up having sex with Ha-neul. Meanwhile, So-ra, who fell asleep first, wakes up, looks for Sang-woo, and hears the sound of the two having sex. Losing her temper in her revenge, So-ra seduces Ha-neul's boyfriend Si-hoo, who is also drunk and asleep in living room, and has sex with him as well.

Sisters Ji-soo and Ji-yeong decided to sell their used underwear due to financial difficulties. Perverted men offer to buy them at a higher price by asking these two sisters for shots of them wearing the underwear. Other men offer to pay even higher prices by demanding sex out of greater desire. As the sisters earn more money than expected, their service becomes more and more popular.

Heojin, who wants to swap, takes her husband, Wonjae, and goes to a pension with Nari and Taeho. Two couples swapping partners and enjoying swapping. Her husband Tae-ho, who was passive at first, rather enjoyed her after seeing him, but her heart is upset.

Hee-soo goes to her ‘rich lover Seok-ho’ while her husbands is on a business trip. Her younger brother Hee-yeong and her husband Jeong-tae are also together. Hee-soo introduces Seok-heo to Hee-yeong and Jeong-tae, and Seok-ho falls in love with Hee-yeoung at first sight. As Seok-ho tries to avoid Hee-soo’s eyes, and meet with Hee-yeong’s eyes instead, he decides to take advantage of Jeong-tae. Jeong-tae who dreamed of having sex with Hee-soo, seduces her, and while Hee-soo and Jeong-tae were playing, Seok-ho wins and took Hee-yeong as price. These people who are complicatedly intertwined, are at a crossroads to choose whether to disperse or become a new family.

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Wikanda is a rich woman with a cheating husband named Apiwat. Kaewta is married to Wanchai, they have a wonderful marriage. Kaewta works for Wikanda at her spa. After a car accident where Wikanda is chasing down her husband’s mistress and Kaewta is in the car with her, they lose consciousness and wake up to discover they have swapped bodies.Seeing that Wikanda is not in her right mind, Apiwat takes her home and drugs her with various psychotic pills. He wants her inheritance and this is his best chance to steal it.

Han Sang Jin is married to Kim Na Young and they have a 7 year old daughter, Min Joo. They live with his mom, younger brother, younger sister, and sister's daughter. One day, Sang Jin vanishes while on a business trip. He remains missing for over 7 years until one day he is spotted by his college friend, Nam Hyun Pil, at a ski resort. Min Joo, now 15, sees him as well but she just thinks he looks like her dad. Hyun Pil begins digging and finds out that the man is called Min Young Tae. Young Tae is married to Hyun Ja and they have a 3 year old son, Ung Pyo. Hyun Ja doesn't care about that all she knows is that he's her husband and the father of her child. Hyun Pil makes the hard decision to tell the truth to Na Young, to whom he's just proposed. The question is now which man will he live as, Han Sang Jin or Min Young Tae, since each man has a different wife.