Makoto and Yayoi had been dating since their student days, but Makoto disappeared after graduating from university. Makoto's older brother, Sei, relayed his brother's unilateral breakup message to Yayoi, and then, wanting to take responsibility for his brother's actions, proposed to her. The two got married. Three years later, Makoto suddenly returned home. In reality, the reason they broke up was a scheme orchestrated by Sei, who was jealous of Makoto's success…

Yeliz leads a happy life with her brother Ahmet, who she is very fond of. But Ahmet Deniz falls in love, and he makes her a marriage proposal, Yeliz's world collapsed. They think, "oh, I get them well apart, as I also did it with all his previous girlfriends." Yeliz begins to make plans with her group of girlfriends to drive the two apart. On the one hand Yeliz, on the other hand, Ahmet Deniz, who tries to protect Deniz against the snares of his sister, without leaving marks Deniz. There awaits all sorts of comic adventures ...

A man finally meets his daughter-in-law for the first time when his son tragically dies. He and the rest of the family like her, but she has a deadly secret.

Jun-woo lives with his brother and his wife. After fighting with his girlfriend, he has a drink with his sister-in-law, local, and consults. Due to his brother's frequent business trips, the lonely brother-in-law seduces Jun-woo to have sex with him.

Tired of married life, the husband turns to his brother-in-law family who is staying at home an a long business trip. The husband, who only washed his fingers for no reason, attracts Casanova to encourage his brother-in-law's affair. In addition, he planned to lay down his brother-in-law's house as bait, but as things went wrong, his wife fell into Casanova's hands. The husband can't let go of his anger. When he confessed that to his sister-in-law and threatened to divorce, she said she would do anything for her good sister. The husband, who suddenly got a double income, slowly zips down, hiding his joy.

Min-sang and Yoo-ra is already married for two years. Min-sang lives with his wife Yoo-ra and her sister Yoo-mi. Min-sang used to live alone because his parents died early, and Yoo-ra lived alone with her younger sister after their parents died in an accident. Because of this mutual understanding, when they were introduced to each other through a dating agency, they became attracted to each other, and they even got married... I'm starting to feel more and more like a woman.

Jang-soo and Seong-yeon have been married for about 10 years, but they have an unspeakable secret; Jang-soo's brother, Jae-cheol. Jae-cheol used to go out with Seong-yeon before she met Jang-soo. And although Jang-soo couldn't help but marry Seong-yeon knowing her past, he himself had a young girlfriend named Eun-hye... Jae-cheol was getting along fine with Eun-hye when one day she breaks up with him. The love story between two brothers in "Big Breasted Sister-In-Law" will soon come out.

Gong-woo argues with her younger boyfriend, Gyoo-won, and goes to her sister Yeon-woo's honeymoon home. Yeon-woo's husband, Jeong-hoon, prepares some drinks for the sisters. Gong-woo and Jeong-hoon end up seeing each other in their underwear and after getting drunk, they cross the line...

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