A young man falls in love with his friend's mother. Hyun-woo, who returned to the military, starts a part-time job at a bar in a difficult situation, where he meets Yoo-sun, a woman who captures the hearts of customers with her skillful ways. Then one day, Hyun-woo, who was alone with her, finds himself in a shock with his friends Min-seok and Yoo-sun. When Hyun-woo confesses the truth after a hard time, Yoo-sun asks her to keep her relationship secret. Hyun-woo, who failed to reject Min-seok's proposal to live in his own home, begins a breathtaking cohabitation with Yoo-sun.

But... we shouldn't do it. As Jin-goo's father suddenly leaves for England for a business trip, he stays in the same house with his stepmother, Ae-ran, who is still in an awkward relationship with him, but it is also uncomfortable to meet him at every meal. Ae-ran tries to take care of her son Jin-goo even if she's busy living every day as an English teacher and working part-time as a private tutor. She sometimes goes to work at night as if she had a part-time job. Meanwhile, Jin-goo often goes to karaoke rooms to meet Woo-mi, who is popular, thanks to the introduction of his senior in the neighborhood. One day, when that senior came home for a drink and encounters a huge fact, he turns around, revealing a huge secret and revealing their mixed erotic romance.