Swapping, That Dangerous Sex

Seung-hye moves to a new house that she has been looking forward to so much with her junior, Na-yeong, but is swindled by a double contract and moves in with a strange man, Soo-cheol, and his senior Hyeon-joon. Armed with powerful male hatred, Seung-hye distanced herself from the men even by dividing the house in half, but her junior, Na-yeong, falls into the hands of Hyeon-joon, a wolf dressed in sheep's clothing. Seung-hye hates men's genitals because male hatred is deeply ingrained in her brain. To this Seung-hye, she suddenly witnessed Soo-cheol's genitals. She tries to forget it, but the penis stuck in her mind and she can't unsee. She concludes that Soo-cheol "fooled her into liking sex" and treats Soo-cheol as a rapist.

Woo-seok happens to meet Gyeong-seo on the street and heads to Gyeong-seo's house. Woo-seok against Gyeong-seo while talking to Gyeong-seo in Gyeong-seo's house. But Gyeong-seo is busy, so she doesn't want to meet a man. Rather, Nam-joo, who lives with Gyeong-seo, falls in love with Woo-seok, and the two of them fall in love in a daze. When Nam-joo fell in love, she felt sorry for the longitude of being alone. Nam-joo decides to connect Gyeong-seo and Jeong-woo by making plans with Woo-seok. In the end, Gyeong-seo and Jeong-woo share love with each other through their performances. But Woo-seok can't erase the scripture from his mind.

Min-hyeok and Sang-mi are a couple since high school. They have never had sex until they became adults. Min-hyeok is the only one who imagines while watching pornographic videos. Min-hyeok is ready, and made up his mind to ask Sang-mi to have her first sex. However, Sang-mi has no desire to have her first sex with Min-hyeok. She hopes it will be an unforgettable experience since they are in love. So Sang-mi suggests to him for them to practice sex first.

Soo Min moved to a urology department in the provinces, so she came to Dae Hyeon's house to lodge. Soo Min, who happened to be interested in seeing Dae Hyeon's genitals, suggests a part-time job to study Dae Hyeon's genitals, but Dae Hyeon, a test taker, is not interested in Soo Min. Hee Jin and Dae Hyeon live in Cheol Soo's boarding house. Hee Jin earns her living expenses through political affairs with Cheol Soo. Upon learning of this fact, Soo Min informs Dae Hyeon that Hee Jin and Cheol Soo had an affair. Knowing that the allowance from Hee Jin was Hee Jin's sexual labor, Dae Hyeon decided not to accept Hee Jin's money anymore and accepted Su Min's offer of part-time job.

College girl and the guy next door! Cousin and the woman next door! Min-joo likes her cousin Min-cheol, but Min-cheol rejects her. Min-joo, whose self-esteem has fallen, seduces Yeong-seok, the guy next door, to regain his self-esteem. Yeong-seok's wife, Soo-jin, is having an affair with Min-cheol. The four secret private lives are exposed by chance, and Yeong-seok and Soo-jin use Min-joo and Min-cheol's minds to continue their affair.

Joo-mi, a quiet church lady, hates to stand out and always wears a cross necklace around her neck. She is a purist who has never met or dated any man. A bully, Won-joon, appears in front of her. Hearing that Joo-mi is still chaste, the desire to seduce her intensifies. For Won-joon who meets women once a month, it was easy to seduce Joo-mi, but it was not easy to steal her virginity. Won-joon, who said goodbye to Joo-mi, who would never let him have sex, started dating Na-yeong. They brag about it to Joo-mi and insult her. Jooo-mi, who was insulted by Won-joon, who she loves so much, had sparks in her heart. Joo-mi decides to have sex with her church friend in revenge against Won-joon.

Sang-min has always been beaten by So-yeon. He is being comforted by Min-yeong, the wife of his junior. Was it because of her sympathy for Sang-min? The two of them get to sleep. Geun-bae takes a peek at them and takes pictures. Geun-bae who liked So-yeon for a long time, always tells her that Sang-min cheats on her so he can sex with her. Unexpectedly, So-yeon who is in love with Sang-min didn't fall for Geun-bae easily.

Ri-na gets a pair of underwear from her boyfriend Geun-ho, but she finds it too different in size. While waiting for Geun-ho in front of his house, she finds Geun-ho and sneaks into the house with Yoo-min and witnesses a hardcore relationship between the two. Ri-na is shocked by Geun-ho's 180-degree change from her, but she later finds out that it was his twin brother Jae-ho, and not Geun-ho. However, Ri-na, who imagined a hardcore relationship, heard the surprising news from Yoo-min that Jae-ho was actually Geun-ho, and when asked to break up, she confessed to Geun-ho that she wanted to have a hardcore relationship with Yoo-min.

Moon-sook is about to pay off his loan and do something but Tae-ho, a villain customer, tears Ji-woo's ass, the only girl and the ace in the store. It became a situation where he has to go into debt again because there's no lady. After many twists and turns, Moon-sook seeks Sae-rom but she refuses to act with another man because she is in love with her master Joon-yeong at first sight. Moon-sook, who has 10 years of experience as a pimp, tries to take Sae-rom away from Joon-yeong. After all the obstacles, as he was about to open a business, villain Tae-ho re-appears.

Jenny hears a great deal of information from the public. The news is that a young widow named Mi-jin received 3 billion won in insurance and is looking for a maid. Jenny and Dae-nam form a partnership. To help Dae-nam seduce Mi-jin and take away 3 billion won, Jenny enters as a housekeeper and tries to seduce Mi-jin's loveR, Jun-ho, to catch Mi-jin's weakness. Finally, Jenny enters Mi-jin's house as a maid, and Dae-nam poses as Mi-jin's lawyer, and the plot of Jun-ho, Jenny, and Dae-nam over Mi-jin's property begins.

Mi-ra, a woman with violent and boyish personality. Jeong-seok, a timid man who finds Mi-ra's violence attractive. Jeong-seok is a visual but his every action and his slouched shoulders make him look really timid. Do opposites really attract? The two people were drawn to each other's different charms. Whenever they're having an intercourse, Mi-ra led everything, and she makes aggressive demands like scribbling on her body or swearing on her. However, the timid man's standard has not changed, and Mi-ra says goodbye to Jeong-seok. He happened to meet Tae-hee by chance. Tae-hee is a hardcore master! She is an instructor who runs a private tutoring center with Seong-ho. Jeong-seok learns the essence of being hardcore from them and begins to straighten his slouched shoulders.

Ji-hye, Yeong-joon, Soo-yeong, and Mi-na enjoys the bachelor party! The next morning, Ji-hye had her ass ripped apart and Yeong-joon had erectile dysfunction, but none of them remembers what happened. They're on the hunt for clues! Three people checked Joon-tae's items in the kitchen. They found out that Joon-tae visited the party. The questioning of Joon-tae revealed that Ji-hye and he had sex but there are more suspicions. The size of Joon-tae's small dick can never tear Ji-hye's ass apart. Who the hell ripped Ji-hye apart?