Yeon-joo and Chan-hyeok loved each other like any other couple at first. However, Chan-hyeok became cold to Yeon-joo, and after fighting, Yeon-joo leaves the house where they lived together. Yeon-joo walked to the place of memories while crying. She recalls her first meeting with Chan-hyeok and tries to forget him by drinking. Chan-hyeok calls Min-ah whom Yeon-joo had met in secret, and Min-ah knows Yeon-joo as Chanhyuk's older sister...

The story of a man who observes couples and contemplates whether it would be good to get married.

Welcome! Come inside to the unmanned AI Hotel! Min-goo and Soo-ji entered an unmanned hotel located in an attractive location. AI that is more human than humans greet them and received fantastic services from the all-rounder male AI, 69, and innocent but sexy female AI, G10. What services do they offer in this unmanned hotel?

So-hee was forced to start taking private lessons because of her mother. Rather than studying, she starts flirting with her tutor, Hyeon-goo. So-hee tells about her tutor to her friend, Mi-na. Mi-na shows interest in So-hee's tutor, so she tells her she wants to meet him. In exchange, she agrees to introduce So-hee to her boyfriend, Seung-mo. Then one day, Mi-na gets a good idea and calls So-hee and Hyeon-goo to start a 2-on-1 special class.

A young gentleman feels sorry for his younger brother and his wife who try to have children every day. His sister-in-law had a heart for him who is more caring to her, than her husband who usually treats her harshly, and when the young man found out about this, he hurriedly leaves his seat. The younger brother gets tired of his wife, who can't have children, and he meets another lover, and he's happy to hear that she's pregnant.

Writer Park lives by writing day by day. One day, he stumbles upon a woman, Hae-joo, who collapsed on the street while taking a walk in the early morning. Hae-joo asks Park to take her home, saying she needs a place to rest. He kindly gives up his studio for a stranger. He begins his secret and cheeky story.

The first story is about the first experience of a dim and innocent man in a karaoke room. The second story is about the experience of a young bride who is dissatisfied with her husband. The last story is about a woman who is in trouble after having drunken sex with her male friend.

Do-hee wants a husband! Yeon-hwa is a married woman with a 100-degree level of prudishness and the highest level of sexual desire! Age is just a decoration. Tommy is an immature man who gets an erection every day due to the scent of a bitch-like woman in heat. And Ho-yoon, Tommy's friend who dreams of divorce due to his uncomfortable sleeping with his wife. A crazy drama about adultery.

Yoo-bi is a wife who is always lonely because of her husband's erectile dysfunction. Her husband is always thinking about what he can do for his wife, so he hires his co-worker to be his wife's sex partner. But as his wife gradually learns of the pleasures of sex with his co-worker, she begins to distance herself from him.

The manager, who is always suspicious of his wife, Ye-in, tells his subordinate to seduce her to test her loyalty. The assistant manager followed the order, but he succeeded in seducing his boss's wife. However, he tells his boss that he failed. The manager regains trust in his wife, but he is completely unaware of what really happened.