Se-young stays alone and works overtime. Her lover, Hye-mi, visits Se-young's company and they have a date there. Suddenly, the new employee, Joo-ah, returns to the company.

Chae-young was invited to the housewarming party, meets her ex Jeong-yoon, who broke up a year ago. She tries to be cool, but it doesn't clear the air of awkwardness. It even gets worse by Jeong-yoon's new girlfriend joins the party. Chae-young seems so weird with Jeong-yoon's girlfriend and subtle atmosphere inside house... Who do you think ruined this housewarming party?

I really want to have sex before I turn 21! Ji-hye looks for her destined someone to go on a date, but it's not as easy as she thought. Who will be her perfect one-night stand?