Three friends have different thoughts about sex, which brings about conflicts. This is a romance story of youth (and sex) that they find their turning point in a relationship through understanding.
Yeo Reum who just got her first job is Ji Hun’s girlfriend. Ji Hun who doesn’t have a specific job is a member of a band named Yellow. Yeo Reum is a realistic girl who works hard to be a decent grownup and she finds it hard to understand Ji Hun who has nothing but only Yeo Reum in his mind. One day, Ji Hun notices that Yeo Reum decided to break up with him and goes to meet her, and she really breaks up with him there. Ji Hun spends a year missing Yeo Reum, and one day, he receives a message from Yeo Reum.
The four become friends in a club bar and their relationship develops. They do not consider each other friends but want to love each other. Some are loyal and want to start a real relationship, but some want fun and playfulness. A love drama about friends looking for a free relationship falling into a complicated love relationship with each other. How will their relationship play out? Will they remain as friends or lovers?