Min Soo's younger brother Kyung Soo says he goes to sleep at Min Soo and Young Hee's house as usual. Due to Young Hee who is busy on business trip and Min Soo who went out for work Kyung Soo while being in the house alone suddenly meets Young Hee's younger sister Ga Hee, who suggests having a beer to resolve the awkward situation between the two of them. Ga Hee, who was drinking beer with Kyung Soo, gets drunk and somehow has sex with Kyung Soo. In fact, Ga Hee came when Min Soo was alone to seduce her brother-in-law.

Joon-pyo is a troublemaker who just got out of prison, and moves in with his brother Joon-seok and his wife Eun-ha. On the first day of meeting his sister-in-law, she looks calm and quiet, but she actually used to be a member of a high school gang. She hands Joon-pyo some money in return for not talking about her past. A few days later, Eun-ha is furious to see her husband having an intimate moment with her sister. Joon-pyo sees this as his chance and approaches a drunken Eun-ha...

Min-wook loves his roommate friend Yeongsu's older sister, Sujin. However, Sujin will soon marry a man who meets the condition. I try to hide my heart and wish my sister happiness, When she sees her divorced a few months later, the old feelings come back to life. Soo-jin, who is divorced, will stay in her sister's house for the time being. Min-wook and Su-jin, who have been in one house, are now trying to confirm their love for each other...

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

A son invites his friend over to take care of his mother and lines are crossed that shouldn't be..

Two friends vacation on Jeju Island and meet up with young men who they knew. After a hot night, the girls meet the men again and enjoy a pleasant trip to Jeju Island.

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...

As a pickpocket, Hye-bin gets stuck on Seok-gwang's gambling table one day and doesn't realize that those days are the beginning of darker days in her life. Who will survive the last round of gambling? After all the games, Hye-bin steals Seok-gwang's money and runs away.

A lonely young man is in dire straits, but his friend's mothers don't see him as a boy, but as a man, and take extra interest in him.

Repeat student Hyung-joon heads to a boarding school where he is immediately enamored of his beautiful math teacher.