Seo-yeon likes Jin-woo, her friend since high school. She is satisfied with their current relationship where she hides her feelings and stay as a friend. Jin-woo is not greedy because he didn't have a girlfriend for a long time. Dong-hyeon, who secretly likes Seo-yeon, knows that Jin-woo and Seo-yeon like each other, but he doesn't say anything. As time went by, Dong-hyeon found out that Seo-yeon was unlikely to like him, and asked Seo-yeon to sleep with him because she will connect him to Jin-woo. The two men's mixed love between a woman is just beginning.

Jin-woo sees Seo-yeon and Dong-hyeon together and makes fun of the two. Annoyed with Jin-woo's jokes, Seo-yeon leaves but Dong-hyeon bit Jin-woo's words and misunderstands Seo-yeon's liking for him. Jin-woo starts teasing Dong-hyeon excitedly. Dong-hyeon who is clueless about anything is excited about his relationship with Seo-yeon.

Da-hee and Min-soo, who seem to be a good couple, eat together and take a walk. They are always seen holding hands and taking a walk, so people envies them on the street. In fact, Da-hee had a husband. A mysterious man who comes after her husband goes to work... Da-hee's love story, who walks a dizzying tight rope between two men, is just unfolding.

Jun-ho and Da-hee bumped into each other on the street. The two fell in love and confides with their friend Min-soo. Knowing that the two will miss each other, Min-soo spends his last sweet moment with Da-hee, his sex partner, and arranges a place for them to meet. The hot story of Da-hee's choice between two men who think that friendship is the most important, is just beginning.

Drunk Min-woo and Jae-hyeon attack Na-yeon's house. There, Jae-hyeon confirms that he likes Na-yeon. Min-woo secretly enjoys sex with Na-yeon, knowing that Jae-hyeon likes her. When she learns that he likes her, Na-yeon tries to use her heart... she is happy without knowing anything.

Private secret of Na-yeon and Min-woo, the teacher who teaches herself from old times! As Min-woo's grades go up a lot, Na-yeon invites him to her house for a special class. Usually, she is a calm teacher, but her personality changes whenever she touches her body. Meanwhile, Na-yeon had another student named Jae-hyeon, who knows the relationship between Na-yeon and Min-woo and is jealous, but only enjoys the current situation. A special private tutoring class for two students and a female student, which is secretly conducted, is just beginning.

Sol came home after not dating for a long time. That night, she saw her lonely mom touching herself so she decided to find a boyfriend for her. However, her mom refused and told her she’s fine. Curiously, Sol wanted to find out if her mother already have a boyfriend so she secretly went inside her mom’s room and found her diary…

Da-hyun, the youngest of the three sisters, usually follows her brother-in-law well. When the youngest sister-in-law said that she found a boyfriend, brother-in-law Jun-seo congratulates her and prepares dinner. The next day, Da-hyun's boyfriend Jin-goo, goes to her house to thank her. Upon arriving, Jin-goo witnessed a shocking scene...

So-yeon is on a weekend date with her boyfriend, Ji-seok, and then she invites him to her house to save money on the motel. Her step brother, Sang-woo, comes home earlier than expected and sees them having sex. He records them secretly and plans to blackbail So-yeon with it.

A young man is preparing for the public official exams and is invited to his aunt's house to stay to save money. There he encounters an unexpected attraction.