Na-hee spends a day with alcohol after parting with her lover, Ji-hoon. Min-yeong knows and tries to take care of Na-hee. However, Na-hee does not forget Ji-hoon, and in fact, Ji-hoon and Min-yeong, who was former partner, have a relationship with Ji-hoon, who came to Na-hee. Na-hee, who is not aware of this fact, contacts Ji-hoon again, asking for forgiveness.

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.

In a big house that suddenly opened, a boarding student is looking for someone to share money and loneliness with. A boarding student happened to come to Ga-yeong's house through a friend's introduction. However, the boarding school student, who naturally thought she was a woman, was an adult male, and Ga-yeong continues to be wary of Hyeon-min. However, as soon as she finds out that Hyeon-min is a good person, Ga-yeong seduces him. Meanwhile, Hyeon-min's friend Jeong-woo happens to visit Ga-yeong's house... and the sweet and bloody story unfolds between two friends with a woman between them.

Dong-hoon moves to a new house. On the day of moving, he comes to the landlord to pick up the keys he didn't receive. He is happy to be seeing the beautiful Ji-hyeon. Ji-hyeon noticed Dong-hoon's interest. Dong-hoon had a housewarming celebration with his friend Min-soo. Ji-hyeon started to take a hold on the drunk Min-soo and then passed out in no time. The next day, Dong-hoon happily welcomes Ji-hyeon, who came to him without knowing what happened.

Two men love one woman. Seo-yeon chooses who to have a relationship with, every time. Jin-woo and Dong-hyeon competes with Seo-yeon's attention, but she doesn't think the setup is strange. Actually, there is a reason why she doesn't want to choose between the two. Who will win Seo-yeon's love in the end? The unending love story between the three is just beginning.

徐妍被比自己还小的宇贤当起了家教老师，第一次见到家教老师宇贤的瞬间就产生了好感，宇贤也对美丽的徐妍颇有好感。徐妍在朋友 敏珠的帮助下成功勾引了宇贤..但太不懂事的敏珠知道徐妍的心思，却自己也接近了宇贤....而且看到敏珠和宇贤的相遇，生气的徐妍对好友敏珠非常生气，为了一个男人而展开的姐妹情仇故事才刚刚开始。

过得十分潇洒的智英和佑贤是关系，但佑贤知道自己的朋友民洙也喜欢智英，决定在两人之间成为垫脚石。民秀和智英经过迂回曲折之后还可以交往吗？还是智英会再次回到佑贤的怀抱呢？围绕着智英的两个男人展开了属于他们的故事。